fix(agent-manager): preserve tab focus and order

[marius-kilocode]

What Problem This Solves

Agent Manager could lose the last focused Local session in multi-project mode and move a restored Local tab to the end of the tab bar when switching worktrees or projects.

Why This Change Was Made

Local session and draft memory was rejected when the special-tab callback returned false. Restoring an existing session also used the append path, which changed its saved position. Project activation now saves the outgoing tab before changing context, and existing Local sessions skip the append path.

User Impact

Switching between Local, worktrees, and projects preserves the active Local session, pending draft, and tab order.

Evidence

• bun run compile
• bun test tests/unit/agent-manager-selection-actions.test.ts tests/unit/tab-order-sync.test.ts tests/unit/agent-manager-arch.test.ts
• Isolated VS Code Agent Manager verification preserved a middle Local tab and restored it after a worktree round trip.

This change includes focused regression coverage and a patch changeset.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• .changeset/quiet-local-tabs.md
• packages/kilo-vscode/tests/unit/agent-manager-selection-actions.test.ts
• packages/kilo-vscode/webview-ui/agent-manager/AgentManagerApp.tsx
• packages/kilo-vscode/webview-ui/agent-manager/selection-actions.ts

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_{Reviewed by grok-4.6 · Input: 110.8K · Output: 10.5K · Cached: 295.9K}

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