fix(recording-dialog): +20% height so the file-name box is not clipped; unhook full-screen hook on shutdown

RenameRecordingDialog was 230px tall for ~225px of stacked content —
the file-name textbox clipped (old client area ~193px). Height is now 276
(+20%). Integration test shows the real dialog in the app host and asserts
the textbox bottom edge stays inside the client area; the dialog's Icon moved
to the explicit /ytLive;component/ URLC form MainWindow already uses so tests
can construct it (root-relative /Assets/... only resolves in production via
Application.ResourceAssembly).

Dependency fix: MainViewModel.Shutdown() now calls
_fullScreenDetector.StopWatching(). The global EVENT_SYSTEM_FOREGROUND hook
was never unhooked; after VM collection the next foreground event invoked a
garbage-collected WinEventProc delegate, crashing the whole test run. Harmless
in production (exits the process) but fatal in the multi-window test host.

Reference: WPF WinEvent hook lifecycle guidance — SetWinEventHook callbacks
must be unhooked before the owning object is collected (obs-projector
fullscreen-detection pattern).

HANDOFF.md

@@ -1,15 +1,9 @@
-# HANDOFF — 2026-09-18 (layer drag-reorder persistence fix committed locally — no push)
+# HANDOFF — 2026-09-18 (drag-reorder persistence + recording-dialog height, both local — no push)
 
 ## Branch / Commit State
 
-`main` HEAD = **layer drag-reorder now traps + persists** (local, this session — the new
-`LayerReorderPersistenceTests`). Below it:
-
-- `75723ac` fix(webcam): offer the Web Cam row only when a camera is attainable (live lock)
-- `9d00955` feat(webcam): app-default gate slice — per-scene offer, Add places default directly,
-  identity survives removal
-- `1e4017d` feat(webcam): resource lifecycle startup slice — poll-on-start, single-cam lock,
-  persistent Layers alert
+`main` HEAD = **Rename Recording dialog 20% taller + teardown unhooks the full-screen hook** (local).
+Below it: the layer drag-reorder persistence fix (`LayerReorderPersistenceTests`), then webcam work.
 
 **No push yet.** Working tree clean.
 
@@ -70,6 +64,22 @@ ScheduleSave()`, i.e. the same background-save path every other mutation uses. *
 calls the trap, pumps the dispatcher until the debounced save lands, asserts the DB `Source`
 SortOrder matches the in-memory `Elements` order.
 
+## ✅ Committed — Rename Recording dialog taller + full-screen hook unhooked on shutdown (2026-09-18)
+
+- `RenameRecordingDialog.xaml` `Height` 230 → **276** (+20%, creator: textbox cut off). The fix is
+  real: content naturally needs ~225px, the old client area at 230 was ~193px (clipped), at 276 it's
+  ~239px (fits). **Good Dog test** `RenameRecordingDialogSizingTests`: shows the real dialog in the
+  RealApp host and asserts the file-name textbox bottom edge is inside the client area. The dialog's
+  `Icon` was changed from root-relative `/Assets/...` to the explicit `/ytLive;component/...` (the
+  form `MainWindow.xaml` already uses) — root-relative only resolves in production via
+  `Application.ResourceAssembly`, so dialogs couldn't be constructed by tests otherwise. The other
+  dialogs still use the fragile form; fix as they get tested.
+- **Teardown leak fix (dependency, discovered by the above):** `MainViewModel.Shutdown()` now calls
+  `_fullScreenDetector.StopWatching()`. The global `EVENT_SYSTEM_FOREGROUND` hook was never unhooked,
+  so after the VM was collected the next foreground event invoked a **garbage-collected
+  `WinEventProc` delegate → process crash** ("Test Run Aborted" in the suite). Harmless in production
+  (exits the process) but fatal to the multi-window test host when a test shows/foregrounds a window.
+
 ## ✅ Earlier committed — webcam resource lifecycle (startup slice, `1e4017d`)
 
 Startup poll + tri-state (`ValidateWebcamResourceStartupAsync` after `LoadLayout`): 0 → run on,
@@ -84,9 +94,7 @@ claim — `CameraConflictProbe` reads process names only, no device handles; do
 
 ## ⚠️ Open items
 
-- **RenameRecordingDialog too short (creator-reported, QUEUED next):** the recording save/confirm
-  dialog cuts off the file-name textbox — increase its height by ~20% (+ its one integration test,
-  Good Dog).
+- **RenameRecordingDialog too short — DONE (see below).**
 - **Webcam take fix 2 of 2 — the 09:16 crash is UNFIXED (hard, untested):** hypothesis — native WMF
   death when `MediaCapture.Failed` fires mid-stream and `SafeStopAsync` (fire-and-forget) disposes
   reader+capture while the frame thread sits in `TryAcquireLatestFrame`/`Marshal.Copy` (outside the
@@ -143,6 +151,10 @@ claim — `CameraConflictProbe` reads process names only, no device handles; do
 - ffmpeg/ffprobe: `/mnt/c/Program Files/Krita (x64)/bin/` with Windows paths.
 - `MyMistakes.md`: WINRT resource-allocation RECIPE, freeze-audit RECIPE, A/V sync recipe, deadline
   pacing, CoreMessaging DQ, WGC-CLIP + slice blocks. Grep before re-deriving.
+- **Test-host crash (fixed 2026-09-18):** "callback was made on a garbage collected delegate …
+  `Win32FullScreenDetector+WinEventProc`" — `Shutdown()` now unhooks the foreground-event hook; never
+  re-introduce `StartWatching` without a matching teardown, and dialogs whose `Icon` is the
+  root-relative `/Assets/…` form can't be instantiated by tests (use `/ytLive;component/…`).
 - **Scene.Elements layer tests:** any seeded scene with `HasBackground=1` loads a healed
   `Background` element pinned at `Elements[0]` (created by `EnsureBackground` on `StagedScene` set) —
   compute expected layer orders from the live collection, never hardcode indices.