Refresh docs with current schema and guidance
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AGENTS.md
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AGENTS.md
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@ -1,71 +1,49 @@
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This repository contains a static web app for searching a large music metadata database (no server/API calls). It uses:
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- Bulma (`bulma.min.css`) for UI (https://bulma.io/documentation/)
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- A single HTML file (`index.html`)
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- A single JS file (`script.js`)
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- A small site stylesheet (`site.css`) for project‑specific tweaks (no frameworks)
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- A client-side SQLite database (WASM) fetched as a static asset (paged with HTTP Range if available)
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# Agent Guide
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Keep implementation details minimal; this file orients agents to project structure, constraints, and the data model.
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This document orients automation agents and contributors to the mp3-com-meta-browser project. The app is a static, single-page experience for browsing a large mp3.com metadata dataset entirely in the browser.
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---
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## Goals (for agents)
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- Provide a responsive search UI over a large SQLite metadata DB entirely in-browser.
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- No server-side code; all queries run client-side.
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- Fast startup, predictable UX, minimal dependencies.
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## Mission
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- Deliver a fast, predictable search and browse experience over the bundled metadata database.
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- Keep the implementation lightweight: no server-side code, no build system, minimal dependencies.
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- Preserve accessibility, keyboard navigation, and responsive layout from mobile through desktop.
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## Non-Goals
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- Hosting or streaming audio files.
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- Write access to the DB.
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- Complex build systems or frameworks.
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- Mutating the SQLite database (it's read-only at runtime).
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- Introducing new frameworks, bundlers, or complex build steps.
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---
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## Runtime & Architecture
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- `index.html` is the only HTML page and contains `<template>` definitions for base views (`tpl-*`) and overlay dialogs.
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- `script.js` bootstraps the app, loads the WASM SQLite runtime, manages view transitions via `UX.replace(...)`, and handles overlays with `UX.openOverlay(...)` / `UX.closeTop()`.
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- Bulma (`bulma.min.css`) supplies the UI vocabulary; project-specific tweaks live in `site.css`.
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- The SQLite database (`assets/mp3com-meta.sqlite`) is fetched lazily using the HTTP virtual file system so only required pages are read.
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- `sql.js` (bundled `sql-wasm.js` / `sql-wasm.wasm`) provides SQLite + FTS5 inside the browser.
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## Repository Layout (expected)
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## Key Assets
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- `index.html` – SPA shell, templates, base structure.
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- `script.js` – Application state, data layer, helpers, and view constructors.
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- `site.css` – Minimal overrides, transitions, and utility classes.
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- `assets/mp3com-meta.sqlite` – Read-only metadata database.
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- `bulma.min.css` – Upstream Bulma build; keep pristine.
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/
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- index.html # Single-page app shell
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- bulma.min.css # Bulma CSS (pinned)
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- site.css # Site-specific styles (tiny utilities like transitions)
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- script.js # All app logic
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- /assets/
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- mp3com-meta.sqlite # Metadata DB (read-only)
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- AGENTS.md
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## Data Access Notes
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- Expect to run entirely client-side; the database is opened with read-only mode via `sql.js`.
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- Always page results with `LIMIT ? OFFSET ?`; avoid `SELECT *` unless fetching a single record by ID.
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- Prefer prepared statements or cached query strings when querying repeatedly.
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- HTTP servers used in development or deployment must send `Accept-Ranges: bytes` so the VFS can issue range requests.
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- If subfolders are added later (icons, fonts), prefer `/assets/...`.
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- Do not introduce bundlers unless requested.
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---
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## UI/UX Conventions
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- Use Bulma components (containers, navbar, form controls, tables, pagination).
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- Default to semantic HTML + Bulma classes; avoid inline styles.
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- Place any site-specific CSS (e.g., small transitions like fade utilities) in `site.css`.
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- Accessibility: ensure focus states, label–input associations, and ARIA for dynamic content.
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---
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## Data Access (Client-Side)
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- Use SQLite compiled to WebAssembly in the browser.
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- Prefer an HTTP VFS (range requests) to avoid fetching the entire DB up front.
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- Queries should be read-only; no schema migrations/run-time writes.
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Minimal runtime expectations
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- One network fetch for the WASM runtime.
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- The DB file (`/assets/mp3com-meta.sqlite`) fetched lazily by page(s) as needed.
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---
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## Database Schema (authoritative)
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## Database Schema
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Use the current schema when writing queries or documentation:
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```sql
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PRAGMA foreign_keys=ON;
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CREATE TABLE IF NOT EXISTS artists(
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CREATE TABLE artists(
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id INTEGER PRIMARY KEY,
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name TEXT NOT NULL COLLATE NOCASE UNIQUE
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);
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CREATE TABLE IF NOT EXISTS albums(
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CREATE TABLE albums(
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id INTEGER PRIMARY KEY,
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artist_id INTEGER NOT NULL REFERENCES artists(id),
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title TEXT COLLATE NOCASE,
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@ -73,7 +51,7 @@ CREATE TABLE IF NOT EXISTS albums(
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UNIQUE(artist_id, title, year)
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);
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CREATE TABLE IF NOT EXISTS tracks(
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CREATE TABLE tracks(
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id INTEGER PRIMARY KEY,
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artist_id INTEGER NOT NULL REFERENCES artists(id),
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album_id INTEGER REFERENCES albums(id),
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@ -86,204 +64,81 @@ CREATE TABLE IF NOT EXISTS tracks(
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samplerate_hz INTEGER,
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channels INTEGER,
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filesize_bytes INTEGER,
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sha1 TEXT, -- optional; may be NULL
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sha1 TEXT,
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relpath TEXT NOT NULL
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);
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-- External-content FTS5 (search over key text fields)
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CREATE VIRTUAL TABLE IF NOT EXISTS fts_tracks USING fts5(
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title, artist, album, genre,
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content='tracks', content_rowid='id',
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tokenize = 'unicode61 remove_diacritics 2',
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CREATE TABLE site_stats (
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name TEXT PRIMARY KEY,
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value TEXT NOT NULL
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);
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CREATE VIRTUAL TABLE fts_tracks USING fts5(
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title,
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artist,
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album,
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genre,
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content='tracks',
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content_rowid='id',
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tokenize='unicode61 remove_diacritics 2',
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prefix='2 3 4'
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);
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-- Keep FTS index in sync
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CREATE TRIGGER IF NOT EXISTS tracks_ai AFTER INSERT ON tracks BEGIN
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INSERT INTO fts_tracks(rowid,title,artist,album,genre)
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VALUES (new.id,
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new.title,
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(SELECT name FROM artists WHERE id=new.artist_id),
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(SELECT title FROM albums WHERE id=new.album_id),
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new.genre);
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END;
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CREATE TABLE 'fts_tracks_data'(id INTEGER PRIMARY KEY, block BLOB);
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CREATE TABLE 'fts_tracks_idx'(segid, term, pgno, PRIMARY KEY(segid, term)) WITHOUT ROWID;
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CREATE TABLE 'fts_tracks_docsize'(id INTEGER PRIMARY KEY, sz BLOB);
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CREATE TABLE 'fts_tracks_config'(k PRIMARY KEY, v) WITHOUT ROWID;
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CREATE TRIGGER IF NOT EXISTS tracks_ad AFTER DELETE ON tracks BEGIN
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INSERT INTO fts_tracks(fts_tracks, rowid) VALUES('delete', old.id);
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END;
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CREATE INDEX idx_tracks_artist_id ON tracks(artist_id);
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CREATE INDEX idx_tracks_album_id ON tracks(album_id);
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CREATE INDEX idx_tracks_year ON tracks(year);
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CREATE INDEX idx_tracks_genre ON tracks(genre);
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CREATE INDEX idx_artists_name ON artists(name COLLATE NOCASE);
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CREATE INDEX idx_artists_name_nocase ON artists(name COLLATE NOCASE);
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```
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CREATE TRIGGER IF NOT EXISTS tracks_au AFTER UPDATE ON tracks BEGIN
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INSERT INTO fts_tracks(fts_tracks, rowid) VALUES('delete', old.id);
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INSERT INTO fts_tracks(rowid,title,artist,album,genre)
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VALUES (new.id,
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new.title,
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(SELECT name FROM artists WHERE id=new.artist_id),
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(SELECT title FROM albums WHERE id=new.album_id),
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new.genre);
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END;
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`site_stats` stores pre-computed metrics that power the stats dashboard. The FTS data tables are SQLite internals; do not query them directly.
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CREATE INDEX IF NOT EXISTS idx_tracks_artist_id ON tracks(artist_id);
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CREATE INDEX IF NOT EXISTS idx_tracks_album_id ON tracks(album_id);
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CREATE INDEX IF NOT EXISTS idx_tracks_year ON tracks(year);
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## UI/UX Conventions
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- Stick to semantic HTML with Bulma classes; avoid inline styles.
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- Maintain clear focus states and keyboard navigation. `/` focuses search, `Esc` closes the active overlay, and list views support arrow + Enter activation.
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- Use polite `aria-live` regions for async loading states (see `createAsyncListState`).
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- Keep DOM renders incremental—do not preload entire datasets or render long tables without pagination.
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Notes
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- Text search should use `fts_tracks MATCH ?` and join back to `tracks` for details.
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- Sorting for display can use `ORDER BY rank` (FTS) or `artist,title,year`.
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## Shared Utilities (already implemented in `script.js`)
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- `createTableRenderer` – Safely renders tabular data with built-in HTML escaping.
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- `createPagination` – Standard pagination controls with page size selector.
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- `Keyboard` helper – Normalizes Enter/Esc handling for list rows and overlays.
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- `createAsyncListState` – Manages loading, error, and empty states for async lists.
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---
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## View Status
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- [x] Navigation hub (`tpl-nav`, `createNavView`).
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- [x] Search (`tpl-search`).
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- [x] Browse Artists (`tpl-browse-artists`).
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- [x] Browse Albums (`tpl-browse-albums`).
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- [x] Browse Years (`tpl-browse-years`).
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- [x] Browse Genres (`tpl-browse-genres`).
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- [x] Stats (`tpl-stats`).
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- [x] Artist overlay (`tpl-artist`).
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- [x] Album overlay (`tpl-album`).
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- [x] Track overlay (`tpl-track`).
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- [ ] Filters overlay (`tpl-filters`).
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- [ ] Keyboard shortcuts overlay (`tpl-keyboard-shortcuts`).
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- [ ] About / help overlay (`tpl-about`).
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- [ ] Error overlay (`tpl-error`).
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## Example Queries (for agents)
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## Implementation Guardrails
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- Keep JavaScript modular inside `script.js`; annotate non-obvious sections with short explanatory comments when necessary.
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- Reuse existing helpers before adding new ones.
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- Store new assets under `assets/` and prefer lazy loading.
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- Do not modify `bulma.min.css`; override in `site.css` if required.
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- Maintain ASCII-only sources unless a file already contains UTF-8 text that requires preservation.
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Free text:
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## QA Checklist Before Delivery
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- Serve the site via a local static server and load `http://localhost:8000/`.
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- Confirm the console is clean (no errors or unhandled promise rejections).
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- Verify keyboard navigation (Tab, arrow keys, Enter, Esc) across base views and overlays.
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- Exercise search and pagination to ensure queries remain performant (< ~300 ms after warm-up).
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- Validate layout on both narrow and wide viewports.
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SELECT t.id, a.name AS artist, t.title, IFNULL(al.title,'') AS album, t.year, t.genre
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FROM fts_tracks f
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JOIN tracks t ON t.id=f.rowid
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JOIN artists a ON a.id=t.artist_id
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LEFT JOIN albums al ON al.id=t.album_id
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WHERE f MATCH ? -- e.g., 'queen "bohemian rhapsody"'
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ORDER BY rank LIMIT 50;
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By artist prefix (fast via FTS `prefix`):
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WHERE f MATCH 'artist:beatl*'
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Count by year:
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SELECT year, COUNT(*) FROM tracks GROUP BY year ORDER BY year;
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---
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## Local Development
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- Serve statically (to enable range requests and avoid file:// issues):
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- Python: `python3 -m http.server 8000`
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- Node: `npx http-server -p 8000`
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- Open `http://localhost:8000/`
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- Ensure the server sends `Accept-Ranges: bytes` for `/assets/mp3com-meta.sqlite`.
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---
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## Performance Guidance
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- Keep initial DOM minimal; render results incrementally (virtualized list if needed).
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- Debounce search input (e.g., 200–300 ms).
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- Use `LIMIT`/pagination; avoid `SELECT *` on large result sets.
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- Cache prepared statements in JS if the WASM wrapper allows.
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---
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## Quality Bar
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- No console errors.
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- Basic keyboard navigation works.
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- Layout adapts from mobile → desktop via Bulma columns.
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- Reasonable query latency for common searches (<300ms after warm-up).
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---
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## Security & Privacy
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- No third-party trackers.
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- Only static file loads; no credentials.
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- If adding analytics, prefer privacy-preserving, self-hosted options and document them.
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---
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## Agent Etiquette
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- Do not introduce new build steps or frameworks unless explicitly asked.
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- Keep diffs small and focused.
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- When editing `index.html`/`script.js`, include inline comments explaining assumptions.
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- Verify changes against the schema above.
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---
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## TODOs / UX Elements Roadmap
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Overview
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- Views are "base" (replace main content) or "overlay" (stacked dialog) via `UX.replace(...)` and `UX.openOverlay(...)` in `script.js`.
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- Each view pairs an HTML template in `index.html` (e.g., `tpl-...`) with a creator in `script.js` (e.g., `create...View(db)`), returning `{ kind, el, onShow?, destroy? }`.
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- Use Bulma form/table/pagination patterns. Keep DOM small; paginate and debounce queries.
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Shared Tasks
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- [x] Add small table/list renderer util in `script.js` to build rows safely (uses `escapeHtml`). Implemented via `createTableRenderer`.
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- [x] Add shared pagination component (Prev/Next, page size select). Propagate `LIMIT/OFFSET`. Implemented via `createPagination`.
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- [x] Add common keyboard handlers: Enter to open selection; Esc to close overlays (already wired globally). Implemented via shared `Keyboard` helper in `script.js`.
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- [x] Add loading/empty-state helpers for lists. Implemented via `createAsyncListState` utility.
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Primary Navigation (Hub)
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- [x] `tpl-nav` (base): Landing hub to choose "Search", "Browse Artists", "Browse Albums", "Browse Years", "Browse Genres", "Stats".
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- [x] `createNavView(db)`: Buttons/cards trigger `UX.replace(...)` to corresponding base views.
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- [x] Accessibility: initial focus on first action; arrow-key navigation across items; visible focus states.
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Search (Existing)
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- [x] `tpl-search` (base): Input is focusable; shows results area.
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- [x] Implement query execution with FTS join; debounce 250 ms; paginate results. Wired into the new table + pagination helpers.
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- SQL: `SELECT t.id, a.name AS artist, t.title, IFNULL(al.title,'') AS album, t.year, t.genre FROM fts_tracks f JOIN tracks t ON t.id=f.rowid JOIN artists a ON a.id=t.artist_id LEFT JOIN albums al ON al.id=t.album_id WHERE f MATCH ? ORDER BY rank LIMIT ? OFFSET ?`.
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- [x] Column sorts (toggle rank vs artist,title,year).
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- [x] Row activation opens Track overlay.
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Browse Artists
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- [x] `tpl-browse-artists` (base): Alphabetical list, A–Z quick jump, mini filter box; paginated.
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- [x] `createBrowseArtistsView(db)`: Loads pages; clicking row opens Artist overlay.
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- SQL: `SELECT id, name FROM artists ORDER BY name LIMIT ? OFFSET ?`.
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- [x] Optional prefix search using FTS prefix (`WHERE f MATCH 'artist:abc*'`) to accelerate filter. Browse Artists view now favors FTS when filters include ≥2 characters.
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Browse Albums
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- [x] `tpl-browse-albums` (base): List or grid with title, artist badge, year; paginated and sortable by artist/year/title.
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- [x] `createBrowseAlbumsView(db)`: Clicking item opens Album overlay.
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- SQL: `SELECT al.id, al.title, al.year, a.name AS artist FROM albums al JOIN artists a ON a.id=al.artist_id ORDER BY a.name, al.year, al.title LIMIT ? OFFSET ?`.
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Browse Years
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- [x] `tpl-browse-years` (base): Year histogram (counts) with list of tracks/albums when a year is selected; paginated.
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- [x] `createBrowseYearsView(db)`: Selecting a year shows tracks; rows open Album/Track overlays.
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- SQL (counts): `SELECT year, COUNT(*) AS cnt FROM tracks WHERE year IS NOT NULL GROUP BY year ORDER BY year`.
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- SQL (tracks by year): `SELECT t.id, t.title, a.name AS artist, IFNULL(al.title,'') AS album, t.genre FROM tracks t JOIN artists a ON a.id=t.artist_id LEFT JOIN albums al ON al.id=t.album_id WHERE t.year=? ORDER BY a.name, t.title LIMIT ? OFFSET ?`.
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Browse Genres
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- [x] `tpl-browse-genres` (base): Genre chips with counts → selecting shows paginated tracks.
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- [x] `createBrowseGenresView(db)`: Genre list with counts; selecting lists tracks; rows open Track overlay.
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- SQL (counts): `SELECT genre, COUNT(*) AS cnt FROM tracks WHERE genre IS NOT NULL AND genre!='' GROUP BY genre ORDER BY cnt DESC, genre`.
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- SQL (tracks by genre): `SELECT t.id, t.title, a.name AS artist, IFNULL(al.title,'') AS album, t.year FROM tracks t JOIN artists a ON a.id=t.artist_id LEFT JOIN albums al ON al.id=t.album_id WHERE t.genre=? ORDER BY a.name, t.title LIMIT ? OFFSET ?`.
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Stats
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- [x] `tpl-stats` (base): Lightweight metrics (totals, top artists, year distribution) linking into browse views.
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- [x] `createStatsView(db)`: Render summary cards; links navigate via `UX.replace(...)` with preselected filters.
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- SQL (examples): totals from `COUNT(*)` on artists/albums/tracks; top artists via `SELECT a.name, COUNT(*) cnt FROM tracks t JOIN artists a ON a.id=t.artist_id GROUP BY a.id ORDER BY cnt DESC LIMIT 20`.
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Artist Overlay
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- [x] `tpl-artist` (overlay): Header: name + counts; tabs: Albums | Top Tracks.
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- [x] `createArtistOverlay(db, artistId)`: Load artist name, counts, then tab content.
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- SQL (albums): `SELECT id, title, year FROM albums WHERE artist_id=? ORDER BY year, title`.
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- SQL (top tracks): `SELECT id, title, year, genre FROM tracks WHERE artist_id=? ORDER BY year, title LIMIT 100`.
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- [x] Actions: clicking album opens Album overlay; clicking track opens Track overlay.
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Album Overlay
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- [x] `tpl-album` (overlay): Header with album title, artist, year; tracklist table with `track_no`, `title`, `duration_sec`, `bitrate_kbps`.
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- [x] `createAlbumOverlay(db, albumId)`: Load album+artist header; then tracklist.
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- SQL (header): `SELECT al.title, al.year, a.name AS artist FROM albums al JOIN artists a ON a.id=al.artist_id WHERE al.id=?`.
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- SQL (tracks): `SELECT id, track_no, title, duration_sec, bitrate_kbps FROM tracks WHERE album_id=? ORDER BY track_no, title`.
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- [x] Row activation opens Track overlay.
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Track Overlay
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- [x] `tpl-track` (overlay): Show title, artist, album, year, genre, duration, bitrate, samplerate, channels, filesize, sha1 (if present), and `relpath` with a Copy button.
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- [x] `createTrackOverlay(db, trackId)`: Load detail from join; add Copy action for `relpath`.
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- SQL: `SELECT t.*, a.name AS artist, al.title AS album FROM tracks t JOIN artists a ON a.id=t.artist_id LEFT JOIN albums al ON al.id=t.album_id WHERE t.id=?`.
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Filters (Optional)
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- [ ] `tpl-filters` (overlay): Advanced filters (year range, min bitrate, genre multi-select) applied to current base view.
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- [ ] `createFiltersOverlay(db, onApply)`: Applies constraints and refreshes the invoking view.
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||||
Help/Meta Overlays
|
||||
- [ ] `tpl-keyboard-shortcuts` (overlay): " / focus search", "Esc close overlay", "j/k navigate" if list navigation is added.
|
||||
- [ ] `tpl-about` (overlay): About/help, privacy note.
|
||||
- [ ] `tpl-error` (overlay): Friendly error with retry; used by views on failure.
|
||||
|
||||
Implementation Notes
|
||||
- Use template IDs in `index.html` and instantiate via existing `instantiateTemplate` helper.
|
||||
- Overlays must add `ux-view--overlay` class (done by UX manager) and include a close button that calls `UX.closeTop()`.
|
||||
- Keep queries read-only; always `LIMIT ? OFFSET ?` for lists; avoid `SELECT *` except for single-row detail.
|
||||
- Respect accessibility: label–input associations, `aria-live` only for async status, focus returned to opener on overlay close.
|
||||
- Performance: debounce search 200–300 ms; cache prepared statements if beneficial; do not pre-render large lists.
|
||||
- UX manager now guards against race conditions during fades: `UX.replace` updates `currentBase` before the fade-in completes and checks that the previous element is still connected before trying to animate it out.
|
||||
Stay within these constraints to keep the project fast, accessible, and easy to host.
|
||||
|
|
|
|||
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