feat(dashboard): add per-row data cleanup in Team Dashboard

[Virginia-Hamra]

Summary

Adds a per-row delete action to the Team Dashboard leaderboard, allowing removal of all stored Azure Table aggregate data for a specific user + dataset combination — without deleting the entire container or other users' data.

What changed

UI (Webview)

• Each leaderboard row now has a 🗑️ trash icon button in a new Action column
• Clicking the button sends a deleteUserDataset message to the extension backend with the row's userId and datasetId
• Minimal CSS additions (.action-header, .action-cell, .delete-row-btn) keep the styling consistent with the existing table design

Extension host

• New handleDeleteUserDataset(userId, datasetId) method in CopilotTokenTracker:
  • Shows a VS Code modal confirmation dialog before any deletion
  • Posts a loading state to the webview while the operation runs
  • Displays success/warning notifications depending on outcome
  • Automatically refreshes the dashboard with fresh data after deletion

Backend

• DataPlaneService.deleteEntitiesForUserDataset() — scans Azure Table entities in the date range, filters by ds:{datasetId} in PartitionKey and u:{userId} in RowKey, then deletes each matching entity with timeout protection
• BackendFacade.deleteUserDataset() — orchestrates credentials, invokes the data plane method, and clears the query cache to prevent stale data
• ConfirmationMessages.deleteUserDataset() — user-friendly confirmation message following the existing ConfirmationMessages pattern

Data flow

Webview (click 🗑️) → postMessage({ command: "deleteUserDataset", userId, datasetId })
  → extension.ts handleDeleteUserDataset()
    → VS Code confirmation dialog (modal)
    → BackendFacade.deleteUserDataset()
      → DataPlaneService.deleteEntitiesForUserDataset()
        → Azure Tables: list entities by timestamp + filter PK/RK → deleteEntity() per match
    → QueryService cache cleared
    → refreshDashboardPanel() → fresh getDashboardData() → webview re-renders

Safety constraints

• Scoped deletion: Only deletes table entities matching the exact userId + datasetId — never touches other rows or the blob container
• Confirmation required: Modal dialog with clear explanation before any destructive action
• Partial failure handling: Errors on individual entity deletions are collected and reported without crashing the extension
• No stale UI: Dashboard auto-refreshes after deletion; query cache is invalidated

Files changed

File	Change
src/backend/services/dataPlaneService.ts	Added deleteEntitiesForUserDataset()
src/backend/facade.ts	Added deleteUserDataset(), imported MAX_LOOKBACK_DAYS
src/backend/ui/messages.ts	Added ConfirmationMessages.deleteUserDataset()
src/extension.ts	Added handleDeleteUserDataset(), wired deleteUserDataset message, imported ConfirmationMessages
src/webview/dashboard/main.ts	Added 🗑️ button + action column to leaderboard rows
src/webview/dashboard/styles.css	Added .action-header, .action-cell, .delete-row-btn styles

Testing

• npm run compile passes cleanly (TypeScript + ESLint)
• Manual testing: open Team Dashboard → verify trash icon on each row → click → confirm dialog → data deleted → dashboard refreshes

[Copilot]

Pull request overview

Adds a per-row “delete user + dataset” cleanup action to the Team Dashboard leaderboard, wiring a new webview action through the extension to an Azure Tables deletion routine.

Changes:

• Dashboard webview: add an Action column with a trash button that posts a deleteUserDataset message.
• Extension + backend: add a confirmation flow and a backend facade/service path to delete matching Azure Table entities and refresh the dashboard.
• UI messages/styles: add confirmation message helper and minimal CSS for the new column/button.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/webview/dashboard/main.ts	Adds Action column + 🗑️ button and posts deleteUserDataset message.
src/webview/dashboard/styles.css	Adds styles for action header/cell and delete button hover.
src/extension.ts	Wires deleteUserDataset webview message and implements confirmation + refresh flow.
src/backend/facade.ts	Adds deleteUserDataset() orchestration + cache clear.
src/backend/services/dataPlaneService.ts	Adds deleteEntitiesForUserDataset() to scan and delete matching entities.
src/backend/ui/messages.ts	Adds ConfirmationMessages.deleteUserDataset() helper.

[Virginia-Hamra]

I see there were some recent changes around dataPlaneService.ts while this PR was open.
Before I proceed further, just confirming the per-row cleanup direction is still desired and hasn’t been superseded by another change.
I’ll address the CI type issue shortly.

[rajbos]

Still desired! 😄