fix(timeline): remove the dead Add Full Camera toolbar button (cherry-pick for 1.10.0-rc.2)

[EtienneLescot]

Summary

Cherry-pick of #466 onto release/v1.10.0 for the next RC.

• Remove the "Add Full Camera" icon button from the timeline toolbar (Maximize2, V4Timeline.tsx) — it always looked clickable but silently no-ops (addCameraFullscreen refuses to write a region) on any project without a webcam clip, per the [Bug]: Add Full Camera is offered on projects with no webcam and silently renders nothing #353 gate.
• Add Full Camera stays fully reachable: the C shortcut and the AI agent tool both call the same gated addCameraFullscreen store action, and the timeline lane still renders/edits existing camera-fullscreen regions.
• Drop the two tests that asserted the removed button's enabled/disabled state, and the now-orphaned buttons.addCameraFullscreen string from all 13 locales.

Related issue

No tracked issue — reported directly by screenshot, confirmed non-functional by reading the code path. See #466 for the original review discussion.

Type of change

• Bug fix

Release impact

• Patch

Desktop impact

• Not platform-specific

Screenshots / video

Not attached — this removes one existing toolbar icon (Maximize2, "Add Full Camera") with no other visual change.

Testing

Cherry-picked commit is identical in content to the one already merged and verified on main (#466). Re-ran on top of release/v1.10.0 (currently 1.10.0-rc.1):

• npx vitest run over the affected suites — 71 tests pass
• npx biome check on all changed files — clean
• npx tsc --noEmit — clean
• npm run i18n:check — all 12 locales still match en

Cherry-picked cleanly with no conflicts (git cherry-pick, same 16-file diff).

🤖 Generated with Claude Code

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[EtienneLescot]

Fermeture : le bouton visé n'était pas celui-ci ("Add Full Camera") mais un autre bouton "fullscreen" — je reverte #466 sur main en parallèle.

[EtienneLescot]

Ré-ouverture : #466 était bien le bon fix, la confusion portait juste sur le nom du bouton. Ce cherry-pick vers release/v1.10.0 redevient valide.

[EtienneLescot]

Fermeture : #466 était en fait une erreur — le grisé/disabled du bouton "Add Full Camera" est le comportement voulu (#353), pas un bug. Ce cherry-pick n'a plus lieu d'être.