[UI-3] Implement TrackedTimeProvider (3-level TreeDataProvider)

[zestones]

Context

Part of UI-3 – Tracked Time panel — see vscode-ui-implementation-plan.md § UI-3.

What

Create src/webview/sidebar/tracked-time/provider.js extending TreeDataProvider:

• Level 1 – Repository node: icon + repo name + total h:mm:ss.
• Level 2 – Issue node: #id + issue title + total h:mm:ss.
• Level 3 – Session node: date/time range + duration (leaf).
• Data sourced from StorageService.getSessions().
• Prototype reference: index.html L1811–L1878.

Acceptance criteria

• Tree renders and expands to all three levels.
• Total times are summed correctly at each level.
• Tree refreshes automatically after timer stop, sync, or manual edit.

[zestones]

Note

Implemented in packages/vscode-ext/src/tracked-time-tree.js as a native TreeDataProvider (not a webview) per the implementation plan. The previous webview stub at packages/vscode-ext/src/webview/sidebar/tracked-time/ was removed and the view registration in package.json updated (no "type": "webview").

Architecture

graph TD
    SE[storage-events port] -->|TRACKED_TIMES, PINNED_REPOS, ACTIVE_ISSUE| P[TrackedTimeProvider]
    P -->|getChildren| R[TrackedRepoNode]
    R --> I[TrackedIssueNode]
    I --> S[TrackedSessionNode]
    AS[AggregationService.getRepoBreakdownDetailed] --> P
    SS[StorageService.get] --> P

Loading

Refresh triggers

The provider subscribes to storageEvents and re-fires onDidChangeTreeData whenever any of TRACKED_TIMES, PINNED_REPOS, or ACTIVE_ISSUE change — so timer start/stop, edit/delete, and sync all flow into the tree without a manual refresh command. It also reacts to vscode.workspace.onDidChangeWorkspaceFolders so the workspace filter (#52) stays correct.

Node contextValues

Per the implementation plan (§ UI-3 task 3.1):

• Repo → oc-repo with $(repo) icon
• Issue (active) → oc-issue-active with $(clock) (charts.green)
• Issue (idle) → oc-issue with $(history)
• Session → oc-session with $(history)

Verification

• pnpm run build:vscode ✓
• pnpm test → 185/185 ✓
• pnpm exec biome check → no errors on changed files