[AZ-471] [AZ-473] [AZ-478] [AZ-479] Batch 7 - canvas/photo-mode/network/perf tests

- AZ-471 CanvasEditor draw + 8-handle resize PASS (FT-P-39 fast +
  e2e + FT-P-40 8 sub-tests). Three drifts pinned via it.fails():
  Ctrl+click multi-select (FT-P-41), Ctrl+wheel zoom-around-cursor
  (FT-P-42), Ctrl+drag empty-canvas pan (FT-P-43) — all rooted in
  handleMouseDown's early Ctrl-gate and handleWheel's
  pan-not-adjusted bug.
- AZ-473 PhotoMode 3 ACs all PASS in fast + e2e (FT-P-48 switch
  filter, FT-P-49 auto-select, FT-P-50 yoloId wire across modes
  P=0/20/40 — outbound classNum == classId + photoModeOffset).
- AZ-478 fast 7 + e2e 2: AC-1 user-visible offline indicator,
  AC-2 tainted-canvas fallback, AC-3 SSE disconnect banner —
  all drift today (it.fails fast + test.fail e2e + control
  PASS for each). Service-worker negative check passes.
- AZ-479 AC-1 (bundle <= 2 MB gzipped) promoted from
  on-demand perf script to per-commit static profile via new
  STC-PERF01 row + static_check_bundle_size in run-tests.sh.
  AC-2 (mission-planner exclusion) already covered by STC-S5.
  AC-3 FCP /flights <= 3 s median (chromium suite-e2e) and
  AC-4 30-min annotation soak (RUN_LONG_RUNNING=1, chromium)
  scaffolded as e2e tests.

Code review: PASS (0 findings). Fast: 25/25 files, 150 passed
/ 13 skipped. Static: 25/25 PASS (incl. new STC-PERF01).

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/02_tasks/done/AZ-473_test_photo_mode.md

@@ -0,0 +1,54 @@
+# Test — PhotoMode Switch & yoloId Wire
+
+**Task**: AZ-473_test_photo_mode
+**Name**: PhotoMode switch + auto-select + yoloId offsetting on the wire
+**Description**: Implement the 3 blackbox tests pinning PhotoMode behavior: switching modes sets the offset filter, auto-selecting when the prior class is no longer valid, and the on-wire `classNum == classId + photoModeOffset` assertion.
+**Complexity**: 2 points
+**Dependencies**: AZ-456_test_infrastructure
+**Component**: 06_annotations (PhotoModeContext + AnnotationsPage) (Blackbox Tests)
+**Tracker**: AZ-473
+**Epic**: AZ-455
+
+## Problem
+
+PhotoMode offsets `classId` to `classNum` on the wire (`classNum == classId + photoModeOffset`). Getting this wrong leaks a different class on every save without any user-visible symptom — until a downstream consumer mis-buckets the data.
+
+## Outcome
+
+- 3 scenarios pass — mode switch, auto-select on invalid, wire offset arithmetic.
+
+## Scope
+
+### Included
+
+| Scenario | Profile | Source file |
+|----------|---------|-------------|
+| FT-P-48 — PhotoMode switch — mode set + filter | fast | blackbox-tests.md |
+| FT-P-49 — PhotoMode auto-select when prior class no longer valid | fast | blackbox-tests.md |
+| FT-P-50 — yoloId on the wire — `classNum == classId + photoModeOffset` | fast + e2e | blackbox-tests.md |
+
+### Excluded
+
+- DetectionClasses load + hotkeys (covered in 17_test_detection_classes).
+
+## Acceptance Criteria
+
+**AC-1: Switch sets filter**
+FT-P-48 — toggling PhotoMode updates the rendered class list (filter applied); the selected mode is persisted in `<PhotoModeContext>` (asserted via the rendered filter, not via context read).
+
+**AC-2: Auto-select**
+FT-P-49 — switching to a mode where the currently-selected class is out-of-range auto-selects the first valid class in the new window.
+
+**AC-3: Wire offset**
+FT-P-50 — issue an annotation save in mode P; outbound body carries `classNum == classId + P` for every detection.
+
+## System Under Test Boundary
+
+- System under test: `<PhotoModeContext>` + `<AnnotationsPage>` save call.
+- Allowed stubs: MSW for `/api/annotations/classes` + annotation save.
+- Disallowed: reading `<PhotoModeContext>` state directly.
+- Expected observables per `results_report.md` rows 77-80 region.
+
+## Constraints
+
+- Tests exercise all three modes (P ∈ {0, 20, 40}); each saves a probe annotation and asserts the wire offset.