feat: fix tooltip shortcuts and add dev server config dialog

Tooltip fixes (PR #177 follow-up):
- Remove duplicate title attr on Settings button that caused double-tooltip
- Restore keyboard shortcut hints in tooltip text: Settings (,), Reset (R)
- Clean up spurious peer markers in package-lock.json

Dev server config dialog:
- Add DevServerConfigDialog component for custom dev commands
- Open config dialog automatically when start fails with "no dev command"
- Add useDevServerConfig/useUpdateDevServerConfig hooks
- Add updateDevServerConfig API function
- Add config gear button next to dev server start

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/lib/api.ts

@@ -445,6 +445,16 @@ export async function getDevServerConfig(projectName: string): Promise<DevServer
   return fetchJSON(`/projects/${encodeURIComponent(projectName)}/devserver/config`)
 }
 
+export async function updateDevServerConfig(
+  projectName: string,
+  customCommand: string | null
+): Promise<DevServerConfig> {
+  return fetchJSON(`/projects/${encodeURIComponent(projectName)}/devserver/config`, {
+    method: 'PATCH',
+    body: JSON.stringify({ custom_command: customCommand }),
+  })
+}
+
 // ============================================================================
 // Terminal API
 // ============================================================================