feat(agent-manager): filter sessions by worktree

[marius-kilocode]

Agent Manager session history currently combines sessions from the local workspace and every managed worktree, which makes it difficult to find sessions belonging to the selected worktree.

Add a Worktree source to /sessions whenever a managed worktree is selected. The existing Local source remains the aggregate history, while Worktree limits the same searchable, grouped session list to sessions assigned to the selected worktree. Switching back to the local workspace removes the worktree-specific source and returns history to Local. The source participates in the existing keyboard tab navigation, and its label is localized across every supported language.

Local history remains the aggregate view:

Worktree history limits the list to the selected worktree:

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (8 files, plus 15 i18n locale files)

• packages/kilo-vscode/webview-ui/agent-manager/AgentManagerApp.tsx
• packages/kilo-vscode/webview-ui/src/components/history/HistoryView.tsx
• packages/kilo-vscode/webview-ui/src/components/history/SessionList.tsx
• packages/kilo-vscode/tests/history-accessibility.spec.ts
• packages/kilo-vscode/webview-ui/src/stories/history.stories.tsx
• packages/kilo-vscode/webview-ui/src/styles/history.css
• .changeset/worktree-session-history.md
• packages/kilo-vscode/webview-ui/src/i18n/*.ts (all 22 locales, key added consistently)

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_{Reviewed by claude-sonnet-5 · Input: 48 · Output: 10.9K · Cached: 1.5M}

_{Review guidance: REVIEW.md from base branch main}