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Vance Ingalls
67696cd8de
The Slideshow tab rendered unconditionally, showing the branching editor for any composition regardless of whether it was actually a slideshow — a plain video comp offered a tab with nothing meaningful to edit. Gate it on the composition carrying the slideshow JSON island (<script type="application/hyperframes-slideshow+json">), the same definitive marker the CLI's `present` command already requires (it refuses to run without one). Presence-only, not full manifest validation, so a malformed island still surfaces the tab rather than disappearing entirely. Also bounce rightPanelTab off "slideshow" to "renders" if the active composition stops being a slideshow while that tab is open (e.g. switching files), since its button would otherwise vanish with no way back to it. Extracted the gating + scene-list derivation into useSlideshowTabState to keep StudioRightPanel.tsx under the 600-LOC gate.