feat: update empty state messages and hints in English and Chinese locales

refactor: rename variables for clarity in ReviewSessionPage and SessionsPage

fix: update version check logic in SettingsPage

chore: remove unused imports in TeamPage and session-detail components

fix: enhance error handling in MCP server

fix: apply default mode in edit-file tool handler

chore: remove tsbuildinfo file

docs: add Quick Plan & Execute phase documentation for issue discovery

chore: clean up ping output file

ccw/src/mcp-server/index.ts

@@ -155,7 +155,16 @@ async function main(): Promise<void> {
   // Connect server to transport
   await server.connect(transport);
 
-  // Error handling
+  // Error handling - prevent process crashes from closing transport
+  process.on('uncaughtException', (error) => {
+    console.error(`[${SERVER_NAME}] Uncaught exception:`, error.message);
+    console.error(error.stack);
+  });
+
+  process.on('unhandledRejection', (reason) => {
+    console.error(`[${SERVER_NAME}] Unhandled rejection:`, reason);
+  });
+
   process.on('SIGINT', async () => {
     await server.close();
     process.exit(0);

ccw/src/tools/edit-file.ts

@@ -570,7 +570,9 @@ interface CompactEditResult {
 
 // Handler function
 export async function handler(params: Record<string, unknown>): Promise<ToolResult<CompactEditResult>> {
-  const parsed = ParamsSchema.safeParse(params);
+  // Apply default mode before discriminatedUnion check (Zod doesn't apply defaults on discriminator)
+  const normalizedParams = params.mode === undefined ? { ...params, mode: 'update' } : params;
+  const parsed = ParamsSchema.safeParse(normalizedParams);
   if (!parsed.success) {
     return { success: false, error: `Invalid params: ${parsed.error.message}` };
   }