Fix search input focus and shortcuts

[rsheyd]

What changed

• keep every letter available for typing while the search query has focus
• move focus into search results with the Down arrow and visibly highlight the selected task
• enable result-only shortcuts after focus moves to the results (j/k, arrow navigation, and t for Today)
• add a context-sensitive shortcut bar at the bottom of the search dialog
• leave Enter without an action
• document the search focus model and add regression coverage

Why

Search result shortcuts were intercepting letters such as k, which prevented users from entering ordinary search terms. Separating query focus from result focus makes typing unambiguous while preserving useful task shortcuts after the user deliberately navigates into the results.

Validation

• cargo fmt --check
• cargo test dialog_component (5 passed)
• git diff --check
• cargo test reaches the pre-existing tests/storage/db.rs::test_local_storage_creation failure on clean main; no storage code is changed here

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📥 Commits

Reviewing files that changed from the base of the PR and between 81c680e and c3776c7.

📒 Files selected for processing (4)

• docs/KEYBOARD_SHORTCUTS.md
• src/ui/components/dialog_component.rs
• src/ui/components/dialogs/mod.rs
• tests/ui/components/dialog_component.rs

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[rsheyd]

Superseded by consolidated upstream PR #188, which includes this search-input focus work together with the UI baseline, cache lifecycle, typed operations, and versioned snapshots. Please review and test #188 instead.