feat(settings): add local server restart action (#685)

pr/restart-local-server/testing.md

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+## Validation
+
+- `pnpm --filter @different-ai/openwork-ui typecheck` (pass)
+- `pnpm --filter @different-ai/openwork-ui build` (pass)
+- `pnpm --filter @different-ai/openwork-ui test:health` (fails in this environment: `Timed out waiting for /global/health: Unauthorized`)
+
+## End-to-end gate
+
+- Started Docker stack with `packaging/docker/dev-up.sh`
+- Verified live UI flow via Chrome MCP at `http://localhost:52357/session`
+- Sent prompt: `smoke: hello from chrome mcp`
+- Confirmed assistant response: `Hello! How can I help you today?`
+- Screenshot: `pr/restart-local-server/chrome-mcp-smoke.png`
+
+## Feature-specific note
+
+- This change adds a desktop local-host restart action in Settings.
+- The Docker/Web flow verifies app-server integration health; the restart action itself is desktop-only (Tauri runtime).