feature: animation wallpaper#15
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The resource-pack discovery (PR #13) landed; the wallpaper layer still swaps images instantly with no timed rotation or transition animation. Add a self-contained handoff doc for the next batch: porting CCIMXDesktop's WallPaperEngine + WallPaperAnimationHandler (Fixed/Gradient/Movement + QTimer), re-expressed for CFDesktop's backend-agnostic WallPaperLayer — compose old+new QImage per frame driven by QPropertyAnimation, repaint each frame, instead of CCIMXDesktop's QLabel double-buffer. - new document/todo/desktop/wallpaper_animation_engine.md: context, source references, target architecture, step-by-step todos, config keys, constraints (three-layer/doxygen/ownership/no-silent-fallback/ perf), verification, open decisions, file cheat-sheet. - 13_widget_apps.md: wallpaper section points to the new plan. - status/current.md: the "deferred to next batch" line now links to it.
Port CCIMXDesktop's WallPaperEngine + animation handler semantics into CFDesktop's backend-agnostic wallpaper layer, re-expressed as per-frame QImage compositing instead of QLabel double-buffering. - TransitionComposer: pure composeTransitionFrame() blends prev+cur per progress for Gradient (cross-fade), Movement (slide), Fixed. - WallPaperEngine: config-driven QTimer rotation with Sequential/Random selectors (selectNextWallpaper pure fn) and size/Fixed/disable guards. - WallPaperAccessStorage: add tokenIds() for the Random selector. - WallpaperShellLayerStrategy: transition state machine driven by QVariantAnimation; beginTransition arms state, the layer switch fires onWallpaperChanged which runs the per-frame animation. triggerNextWallpaper reuses the path for future manual switching. - wallpaper_setup: make_layer() reads scaling/background_color from config (previously hard-coded zombie keys). - Config: 6 new switch_* keys in WALLPAPER_CONFIG_TEMPLATE. - Tests: 16 cases (composer/selector/engine), all green; full suite 13/13.
- wallpaper_animation_engine.md: status -> done; append implementation record (files, 3 doc corrections, decisions, engineering choices, verification). - status/current.md: wallpaper line reflects the landed engine. - 13_widget_apps.md: wallpaper rotation section marked landed.
composeTransitionFrame allocated a new target-sized QImage (~8MB at 1080p) and filled it black on every animation frame — ~1GB of malloc/free over a 120-frame transition, the main source of stutter. - Add composeTransitionFrameInto(dst, ...) that composes in place with no fill (prev+cur fully cover dst for every mode). - WallpaperShellLayerStrategy::composeFrame now writes back into cached_scaled_image, reusing the buffer (first write detaches once, subsequent frames are in place). - composeTransitionFrame (test convenience) becomes fill + composeInto, so existing unit tests are unchanged.
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