Harden deck runtime and authoring workflow

[socalindc]

What changed

• retain visited slide state and isolate slide render failures
• harden presenter synchronization with deck-scoped handshakes and build-state sync
• persist and synchronize annotations, redraw anchors as layouts move, and namespace notes
• remove hidden builds from focus and the accessibility tree; add control names and slide labels
• include the existing mobile swipe/scroll work while keeping its upstream PR branch untouched
• fix URL highlighting, dynamic count-up values, and empty/single-point charts
• remove the concealed authoring trigger and reconcile the bundled authoring guidance
• add Vitest regression coverage and CI execution
• upgrade Vite to a patched release

Why

The original project is a strong authoring starter, but presenter startup, stateful slides, annotation persistence, accessibility, and runtime failure containment needed production hardening. This fork keeps the interaction model while making it safer to use for real decks.

Impact

• visited interactive slides stay mounted by default; heavy decks can opt out with preserveSlideState={false}
• presenter sync, notes, and annotations are scoped by <Deck id> or URL path
• annotations now persist locally and sync between tabs
• presentation chrome can be themed through --chrome-* tokens
• existing mobile-swipe-and-scroll remains unchanged for upstream PR Harden Bolt Slides and add editorial Stick deck design #3

Verification

• npx tsc --noEmit
• npm test -- --reporter=dot — 9 tests passed
• npm run build
• npm audit --json — 0 vulnerabilities
• git diff --check