feat: add adaptive live meeting workspace

[Lob0Garou]

Summary

• replace the single cramped meeting feed with an adaptive transcript/copilot workspace
• show a two-column 42/58 layout when expanded and accessible tabs when compact
• segment interim and final speech by speaker, keep transcript history bounded, and throttle live-region announcements
• preserve independent scroll/follow-live state for transcript and copilot panes
• keep footer controls visible and constrain long prose, URLs, and code to their own panes

UX behavior

• Compact overlay: keyboard-accessible Ao vivo and Copiloto tabs
• Expanded overlay: transcript on the left, AI responses on the right
• Independent navigation: scrolling one pane does not move the other
• Go live: a paused pane counts unread stable items without changing the saved auto-scroll preference
• Session reset: clears transcript/workspace state and prevents stale width-animation callbacks from restoring the previous layout
• Accessibility: speaker labels, status announcements, tab semantics, reduced-motion handling, and bounded live-region output

Review structure

The feature is intentionally split into six focused commits:

1. bounded transcript and announcement state
2. independent pane follow-live state
3. adaptive workspace components
4. overlay integration and Electron E2E coverage
5. effect-lifecycle hardening from static review
6. preservation of repeated finals and removal of out-of-scope machine-specific startup changes

Validation

• npm run typecheck:electron
• npm run build
• npm run build:electron
• 34 focused state, scroll, announcement, reset, and presentation tests pass
• Electron Playwright: 6/6 at 100%, 6/6 at 125%, and 6/6 at 150% Windows display scale
• the timing-sensitive 150% scroll-persistence scenario also passed 3/3 isolated repeats
• current React Doctor reports no errors; remaining warnings are heuristic/pre-existing or deliberate transition effects
• git diff --check
• branch-diff scan found no credentials, local user paths, or sandbox overrides
• electron/main.ts has no diff in this PR; startup, sandbox, ABI, and audio lifecycle changes are out of scope

Scope note

This is a large but cohesive UI feature. It is opened as a draft and organized into focused commits so maintainers can review the pure state policies before the components and final integration.

[greptile-apps]

Greptile Summary

This PR adds an adaptive workspace for live meetings. The main changes are:

• Speaker-aware transcript segments with bounded history and announcements.
• Compact tabs and an expanded two-column transcript/copilot layout.
• Independent scrolling, unread tracking, and follow-live controls.
• Session-reset and layout-transition handling.
• Focused state, presentation, and Electron end-to-end tests.

Confidence Score: 5/5

This looks safe to merge.

• The repeated-utterance loss is addressed by assigning each final its own arrival identity.
• Tests cover identical repeated finals, partial-to-final transitions, bounded history, and reset behavior.
• No blocking issue tied to the earlier review findings remains in the updated code.

Important Files Changed

Filename	Overview
src/lib/transcriptSegments.mjs	Adds bounded speaker-aware transcript state and preserves repeated final utterances.
src/components/NativelyInterface.tsx	Integrates transcript events, adaptive panes, scroll restoration, and session resets.
src/components/ui/AdaptiveMeetingWorkspace.tsx	Adds compact tabs, split-pane presentation, focus handling, and unread state.
src/lib/tests/transcriptSegments.test.mjs	Covers repeated finals, partial transitions, speaker ordering, history limits, and resets.

_{Reviews (2): Last reviewed commit: "fix: preserve repeated transcript finals" | Re-trigger Greptile}

[Lob0Garou]

Addressed both review findings in 8e685a8. The machine-specific sandbox/ABI/audio hunks were out of scope and are removed entirely (electron/main.ts now has no PR diff). Lossy text/time deduplication was removed so repeated finals such as consecutive 'sim' responses are preserved. Added regression coverage; 34 focused tests, both builds, typecheck, and all 18 Electron display-scale scenarios pass.