feat(app): gallery presentation mode (draft)

[MerpGoaterman]

Closes #3660

Draft scaffold for a dual-view gallery Presentation mode for shared-screen review. This is not a zoomed-in gallery tile.

UX

Gallery now has two distinct modes, switched by a Present toggle:

1. Normal / compact — today’s mobile-optimized gallery grid is unchanged when Present is off (GalleryViewBase / Card are untouched).
2. Presentation — a separate full-viewport slide experience: one record at a time, large typography, hero cover, keyboard navigation. Inspired by a lightweight HTML slides shell (https://slides-production-c1cf.up.railway.app), not a dense card dashboard.

Controls

• Toolbar Present / Exit Present on app and share gallery views
• ArrowRight / j next, ArrowLeft / k previous in the current filtered set (does not wrap)
• Esc exits
• Overlay chrome: counter, previous/next, exit

State is local UI only (not a persisted view option).

Verification

• vitest run src/features/app/blocks/view/gallery/utils/presentation.spec.ts — 13/13 passed
• ESLint on touched presentation files — clean

Out of scope (follow-ups)

• Field editing inside Present
• Kanban Present
• Persisted view option / deep-link
• Changing the Teable Cloud hosted instance
• Browser/manual QA on a live gallery
• CLA assistant is currently pending on this PR

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[CLAassistant]

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