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feat(bulkProcessing): poll for ongoing bulk action and update table DEV-1411 (#7106)

### 📣 Summary

Data Table now keeps bulk-processing rows up to date automatically by
polling active jobs and refreshing completed cells without needing a
manual page refresh. Hidden behind a feature flag.

### 💭 Notes

Changes here:
- **Bulk processing polling in Data Table**
- Added polling for active bulk jobs with a fixed interval derived from
estimated per-submission processing time.
- Polling is foreground-only to avoid background-tab churn (if you
switch to another tab or minimize the window - polling pauses).
  - Reused shared transcription estimate logic to avoid duplication.
- **Row refresh behavior when jobs complete**
- Added logic to detect status transitions and fetch only affected
visible submissions.
- Added handling for actions disappearing from the active list (terminal
state), so visible rows get refreshed and stale placeholders clear.
- Kept orchestration in the table component and moved refresh-selection
logic into a focused utility.
- **Storybook testability and reliability**
  - Added a dedicated polling scenario story for Data Table wrapper.
- Added stateful MSW handlers that simulate in-progress to complete
transition.
- Added a play function with labeled steps that verifies initial
Processing state and final translated value.
- Added per-story reset of polling mock state so revisiting the story
starts from a clean state.
- Using a timeout derived from the same polling interval logic used in
production, plus a small grace window.
- **Tests**
- Added unit tests for polling interval calculations (empty actions,
translation cadence, transcription cap).
- Added unit tests for visible-row refresh selection across
completion/disappearance/visibility scenarios.
- **Small cleanup**
  - Improved a couple of existing TODO comments to be more actionable.
  - Deleted deprecated and unused single-row submission fetch function.

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