Closes #1206
## Product slice
- imports a local `.ics` calendar without uploading or persisting event data
- unions busy intervals within configurable working hours across all seven Week Ahead dates
- reviews and atomically stages seven capacity totals through the existing offline/account sync path
- keeps the flow touch-safe at 320×568 and available in the packaged offline planning bundle
## Verification
- `pytest tests/ -q` — 2282 passed, 11 skipped
- packaged release verification — passed
- `STACKCHAIN_RUN_RELEASE_E2E=1 pytest tests/e2e/test_mobile_week_ahead_release.py -q` — 4 passed
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Closes #1206
Product slice
.icscalendar without uploading or persisting event dataVerification
pytest tests/ -q— 2282 passed, 11 skippedSTACKCHAIN_RUN_RELEASE_E2E=1 pytest tests/e2e/test_mobile_week_ahead_release.py -q— 4 passed