feat(studio): before/after diff mode for agent iterations#41
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- pure diff_scenarios over baseline/current raw JSON: added/removed/ modified elements by pointer, dot-flattened field changes with exact before/after, scene/video/document grouping, composition-aware; positional matching documented (reorders read as remove+add or same-type modifies); annotations excluded - baseline: app-global path-keyed snapshot captured insert-if-absent at open (watcher reloads are no-ops), Set-baseline button overwrites - flip A/B in the playback bar at the same frame; side A renders from the baseline source string (HTML retranspiled) through a hash-keyed scenario cache, panic-fenced; no overlay on side A so current-layout hit-boxes never lie about the baseline render - side B highlights modified (accent) and added (green) elements via the hit-map overlay; panel entries select and scrub to the element
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Closes #21.
Goal: when an agent reworks a scenario after feedback, the reviewer sees exactly what changed — and that nothing else did.
diff_scenarios(12 TDD tests): added/removed/modified by JSON pointer with exact before→after per field (style recursed, dot-flattened), grouped by Video/Scene/Document, composition-aware. Positional matching documented: reorders surface as remove+add (different types) or same-type modifies.start_atoffset).Tests: 15 new (12 diff + 3 baseline), red-first. 213 total, all green.
Verify:
cargo check -p rustmotion-studio✓ ·cargo test --workspace→ 213 passed ✓ ·cargo fmt --check✓ · clippy 0 warnings ✓