feat(agent-manager): add close others tab action

[kirillk]

Issue

No linked issue. Small Agent Manager tab context menu UX improvement requested directly.

Context

Agent Manager tabs had a Close context menu item, but no way to quickly close every other tab in the current tab strip.

Implementation

Adds Close Others immediately after Close in the session and terminal tab context menus. The action keeps the clicked tab active and closes other session, terminal, and review tabs in the same Agent Manager context. Adds localized labels for the existing Agent Manager dictionaries and a changeset for the user-facing extension change.

Screenshots / Video

How to Test

Manual/local verification

• Agent ran bun run typecheck from packages/kilo-vscode.
• Agent ran bun run lint from packages/kilo-vscode.

Reviewer test steps

1. Open Agent Manager in the VS Code extension.
2. Open multiple Agent Manager tabs in the same context.
3. Right-click a session or terminal tab.
4. Confirm Close Others appears immediately after Close.
5. Select Close Others and confirm only the clicked tab remains active.

Blocked checks and substitute verification

• None.

Checklist

• Issue linked above, or exception explained
• Tests/verification described
• Screenshots/video included for visual changes, or marked N/A
• Changeset considered for user-facing changes
• I personally reviewed the diff and can explain the changes, including any AI-assisted work.

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