Closes #1196
## Product slice
- adds Plan Week Ahead to multi-select Search
- reviews a day and estimate per selected issue before any claim
- validates date, estimate, five-item day limits, duplicate movement, and daily capacity
- requires explicit overload confirmation and flushes one staged Week Ahead update
- reports partial assignment and offline sync outcomes truthfully
- keeps the rendered review touch-safe at 320x568 and 390x844
## Verification
- RED: focused controller test failed because `createWeekBatchPlan` did not exist
- GREEN: `tests/test_search_batch_plan.py` passed (9 tests)
- focused UI/bundle/mobile gates: 116 passed
- full suite: 2268 passed, 11 skipped
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Closes #1196
Product slice
Verification
createWeekBatchPlandid not existtests/test_search_batch_plan.pypassed (9 tests)