Post-launch P1: add bulk row actions and keyboard shortcuts

[honor2030]

Goal

Speed up review work once real users start pushing larger projects through the tool.

Acceptance criteria

• Users can select multiple rows and apply one action.
• Keyboard shortcuts do not conflict with text inputs.
• Shortcuts are documented in a small help hint.

Task list

• Add row selection model to the table.
• Add bulk action toolbar (approve all, reject all, mark unmatched).
• Implement hotkeys (e.g. A=approve, R=reject, U=unmatched).
• Test selection + action edge cases.

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Estimate: 0.5 day