# HANDOFF — 2026-10-08 (zoom box shipped, READY FOR PUSH)

## Branch
- main (no feature branch)

## Push readiness
- **5 commits ahead of origin/main, clean to push** (fetch confirmed origin has not moved):
  `966e718` zoom box visuals → `4b3d82f` zoom as layered + TASK 51 booking → `6bff21b`
  anchored-capture rework → `948dd08` dims-shading fix → (docs unit: TASK 52 record +
  numbering fixes + this HANDOFF).
- The pinned-chat work unit below is **uncommitted on purpose** — `git push` sends only
  commits, so pushing is safe; the dirty files stay local.

## Dirty files (NOT mine — the in-flight "pinned chat" work unit; do NOT commit or co-edit)
- `Models/YouTube.cs`
- `ViewModels/MainViewModel.Chat.cs`
- `Controls/LeftPanel.xaml` (pinned-message UI)
- Untracked: `Helpers/RelayCommandGeneric.cs`

## What just happened (2026-10-08, third zoom pass — dims shading)
The zoom box shipped as a **loupe** (`4b3d82f`), then was corrected to an **anchored-capture
magnifier over the full composite drawn last** (commit `6bff21b`). The final correction: as the box
is dragged, the dim rectangles (55% black "div shading" around the box) were sliding under the
capture region — shown inside the box because its `VisualBrush` samples all of `CanvasGrid`, and the
`DimRects` ItemsControl previously lived INSIDE `CanvasGrid`.

Fix: the `DimRects` overlay is now a **sibling of `CanvasGrid`** (renders above the composed
content, below the `ZoomBox`), never a descendant — so the zoom sample can never pick up the shading
and the captured area stays clear no matter where the box is dragged. Behavior consequence to note:
in non-zoom ("quality dims") mode the dims now also shade the global overlays (brand flash, alert
ticker, social bar) that sit above them in the old tree — consistent with "chrome outside the crop
is dimmed". Structural invariant added to `ZoomBoxInteractionTests`: `DimRectsLayer` is a direct
child of `PreviewCanvas`, not inside `CanvasGrid`, and renders below the `ZoomBox`.

## Zoom feature state
- **TASK 52 (zoom box) is now a first-class record** — see [`TASKS/task-52-zoom-box.md`](TASKS/task-52-zoom-box.md):
  feature provenance + the three creator corrections, shapes, implementation map, tests.
  TASK 51 (webcam background Remove + Blur) is unblocked for the next unit.
- Models: `ZoomState.cs`, `ZoomShape.cs` (Circle/VerticalRectangle/HorizontalRectangle), `ZoomSceneElement.cs`.
- ViewModel (`MainViewModel.Zoom.cs`): `ActivateZoom`/`ToggleZoom`/`DismissZoom`/`StartZoomMove`/`UpdateZoomMove`/`EndZoomMove` + `RebuildDimRectsForZoom`; transient element healed/mirrored by `HealZoomLayers`/`EnsureZoomLayer`.
- Output: box composited last via `BlitZoom`/`ZoomMagnifier`; output crop = tier (box never the crop).
- Preview: `ZoomBox` + `DimRectsLayer` are both SIBLINGS of `CanvasGrid` (box above dims above content); box samples the full composite at the fixed capture, 2x; circle→ellipse clip, rect/square outline per shape; `LeftPanel` hides the placeholder row via `IsZoomLayer`.
- Rectangle shape = 4:3; Circle square; Phone 9:16. Capture anchored on click (`CaptureX/Y`); dragging the box never changes it.

## Tests
- Full suite: **406 passed / 0 failed** on a clean full run (the pre-existing audio-loopback timing
  flake and `RealMouseDrag`'s interactive-desktop requirement recur occasionally — not zoom
  regressions). Zoom tests 3/3 green, 0 build warnings.

## Known issues / follow-ups
- **Background "Use default background" toggle still not working** (carried from 2026-10-07):
  binding exists (`UseDefaultBackground`), VM handler invalidates bake; investigate when time permits.
- The 3px selection / crop-outline strokes could still show in the zoom box IF the capture overlaps
  them in edit mode — not shading, thin outlines only; the dims (the user's complaint) are gone.

## Next step
- User runs the app live to eyeball: drag the zoom box anywhere and the captured content stays clean
  (no dim shading in the box; the scene outside the box stays dimmed). Then TASK 51 (webcam
  background Remove + Blur) per `TASKS/task-51-webcam-bg-effects.md`, and the background-toggle
  investigation if still open.