## What changed
- contain dashboard header, workspace, and mobile dock while Security Center is open
- trap Tab/Shift+Tab across live Security Center controls and close through Escape/history
- preserve containment across section Back/hash changes, including coexistence with other overlay listeners
- verify packaged Chromium behavior at 320×568 and 390×844
## Verification
- `python3 -m pytest tests/test_security_center.py -q` — 9 passed
- `python3 -m pytest tests/ -q` — 2163 passed, 9 skipped
- packaged release checksum — OK
- packaged mobile Home/Security Center journey — 2 passed
Closes #1136
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What changed
Verification
python3 -m pytest tests/test_security_center.py -q— 9 passedpython3 -m pytest tests/ -q— 2163 passed, 9 skippedCloses #1136