Debug, optimize perf & a11y, complete gesture stubs

[devin-ai-integration]

Summary

Cross-cutting debug / perf / a11y / feature-completion pass over the ZSR core library, driven by a walkthrough of lib/core, lib/feedback, lib/interaction and lib/utils.

• Lint hygiene. .prettierignore and eslint.config.mjs now scope root lint to actual project sources: the separate site/htdocs SvelteKit workspace, generated ~partytown vendor files, dist/, node_modules/ and .cache/ are ignored. npm run lint is now green from the repo root.
• ScreenReader queue/race hardening. speaking is initialized in the constructor, and rapid duplicate non-high-priority announcements within 500ms are coalesced, so focus / event retries don't re-queue identical TTS items.
• Emoji / symbol translation perf + correctness. translateEmojis / translateSymbols now precompile a single alternation regex per map, sort keys by length so multi-codepoint sequences (e.g. ❤️, ❤️‍🔥) match before their prefixes, escape special regex chars for the symbol table, and defensively coerce input to string. This turns each call from O(n·k) regex builds into a single O(n) pass.
• Interceptor retry safety. PageInterceptor and WidgetInterceptor both cap their "wait for global" retry chain at ~5s (50 × 100ms) and log an error instead of spinning forever on devices where Page / createWidget is never exposed.
• NavigationManager text cursor fix. The word mode rebuilds words via /\S+/g with real offsets so the cursor jumps accurately across punctuation/whitespace gaps; sentence / paragraph modes and empty-text paths now announce gracefully instead of silently no-oping.
• Gesture stubs completed. scroll_up / scroll_down now translate into focus prev / next (the accessible analogue of scrolling), previous_page calls @zos/router.back(), and next_page either pushes a configurable ScreenReaderConfig.nextPageUrl or announces that no next page is available.
• SoundFeedback. The sound-name map is hoisted to a module-level constant (no per-call rebuild) and a stale PREPARE listener is detached between play() calls to avoid leaking handlers on rapid-fire cues.
• SpeechHistory. Back-to-back duplicate entries within 1s are collapsed into a single entry with a count, so the 50-entry buffer stays useful instead of being pushed out by repeated focus events.

Smoke-tested lib/utils/emojis.js and lib/utils/speechHistory.js under Node 22.13.0; npm run lint passes.

Review & Testing Checklist for Human

Risk: yellow — touches hot paths (TTS queue, navigation cursor, gesture dispatch) but no API changes.

• Sideload on a real Zepp OS device and confirm the screen reader still announces on focus / swipe navigation, and that rapid identical focus events no longer re-speak (should feel calmer, not deaf to legitimate re-focus).
• Exercise 1/2/3-finger swipes up/down and verify scroll_up / scroll_down / next_page / previous_page behave sensibly — in particular confirm previous_page actually calls @zos/router.back() on your page stack.
• Navigate inside a long text element using the word reading mode; verify the cursor lands on each real word and doesn't get stuck mid-sentence.
• Sanity-check that emoji announcements like ❤️ and ❤️‍🔥 are spoken as a single phrase (not a heart followed by an orphan variation selector).

Notes

• site/htdocs/** was deliberately excluded from root lint rather than auto-formatted — it has its own workspace and its own Prettier/ESLint setup, and reformatting it from the root would produce a huge unrelated diff.
• No test suite exists yet (npm test is the placeholder exit 1); verification relied on module smoke tests and manual reading.

Link to Devin session: https://app.devin.ai/sessions/acb85709db3d477e8fc61dbc490e7145
Requested by: @NVCDevelopmentTeam

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