fix(media): prevent duplicate workspace state on full-screen navigation

[veryCrunchy]

Opening or leaving full-screen media could register the same app workspace key twice during one Compose update and crash navigation. Move each workspace as one Compose subtree while keeping desktop chrome outside its state provider. Retain workspace-root settings across viewer navigation without restoring detail or editor state into a different record.

Advances #465. Related adaptive-layout audit findings are recorded in #148.

Validation: rendered Compose scene tests exercise real shell controls, independent app/sidebar state, repeated shell reparenting, returning from immersive media, and opening a different record. Both rendered scene tests and Android debug Kotlin compilation passed locally, along with Kotlin architecture and changelog validation. Hosted Linux and Windows CI passed, and Codex approved the code revision. The subsequent generated capture manifest changed only source hashes, which were independently verified. The PR is merged. No physical Android device validation or published release is claimed.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-14T02:30:49.664839Z	25018c4	New commits

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Reviewed commit: 3ac8406038

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