packaged mobile Chromium CI journey — 19 passed, including 320×568 and 390×844 rendered focus/Back checks
Closes #1134
## Product slice
- makes the work-readiness sheet a real modal by inerting the app shell while open
- traps forward and reverse keyboard focus within visible setup controls
- makes browser Back close Device Setup and restores focus to the launcher
- preserves pre-existing inert state and Today detour resume behavior
## Verification
- `python3 -m pytest tests/ -q` — 2161 passed, 9 skipped
- packaged mobile Chromium CI journey — 19 passed, including 320×568 and 390×844 rendered focus/Back checks
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Closes #1134
Product slice
Verification
python3 -m pytest tests/ -q— 2161 passed, 9 skipped