Reduce session action render cost

[ComputelessComputer]

Reuse derived session view state in floating actions and avoid broad content checks in the overflow menu upload gate.

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Note

Low Risk
Refactor of visibility logic with existing tests; behavior should match prior FAB/overflow rules if currentView stays in sync with the editor.

Overview
Reduces session UI render work by passing the already-derived currentView from the session shell into FloatingActionButton instead of re-deriving the editor tab inside the FAB (via useCurrentNoteTab).

The FAB now hoists Tinybase/AI subscriptions once and drives listen/chat/summary/transcript visibility through pure helpers (shouldShowChatFab, getGenerateSummaryNoteId, getTranscriptFloatingAction) that take currentView plus fetched state.

The overflow menu replaces the broad useCurrentNoteHasContent check with useUploadCurrentViewHasContent, which only reads raw_md, enhanced content, or transcript presence for the active view when deciding whether upload actions appear.

Tests add a renderFloatingActionButton helper with an explicit currentView prop and mock store cells for overflow upload gating.

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[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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