TrueGrowth/openspec/changes/archive/2026-04-29-add-ppt-slide-transitions/tasks.md

1. Data Model

• 1.1 Add PPT slide transition types and sanitization helpers.
• 1.2 Extend PPTFrameMeta with optional transition metadata.

2. Editor UI

• 2.1 Add a right-click animation/transition submenu for single PPT pages.
• 2.2 Show the currently selected transition in the submenu.
• 2.3 Persist transition changes through setFramePPTMeta.

3. Playback

• 3.1 Make FrameSlideshow read per-page transition metadata.
• 3.2 Apply matching lightweight CSS transition effects when navigating pages.
• 3.3 Respect reduced-motion preferences by falling back to no animation.

4. PPTX Export

• 4.1 Change PPT export to produce a Blob/ArrayBuffer before download.
• 4.2 Patch generated slide XML with transition tags for supported transition types.
• 4.3 Preserve existing export behavior when no transitions are configured.

5. Tests

• 5.1 Add unit tests for transition metadata normalization.
• 5.2 Add unit tests for PPTX transition XML injection.
• 5.3 Run targeted PPT tests and a focused typecheck if feasible.