fix(dashboard): update projectId for existing accounts during discovery

Previously, discoverExistingAccounts skipped existing token files
entirely, so accounts created before the projectId feature never
got their projectId populated from auth files.

Now when a token file is already registered, we still check if
projectId needs to be updated for agy accounts.

src/cliproxy/account-manager.ts

@@ -639,6 +639,15 @@ export function discoverExistingAccounts(): void {
       // Skip if token file already registered (under any accountId)
       const existingTokenFiles = Object.values(providerAccounts.accounts).map((a) => a.tokenFile);
       if (existingTokenFiles.includes(file)) {
+        // Token file exists - check if we need to update projectId for agy accounts
+        if (provider === 'agy' && data.project_id) {
+          const existingEntry = Object.entries(providerAccounts.accounts).find(
+            ([, meta]) => meta.tokenFile === file
+          );
+          if (existingEntry && !existingEntry[1].projectId) {
+            existingEntry[1].projectId = data.project_id;
+          }
+        }
         continue;
       }
 
@@ -710,7 +719,7 @@ export function discoverExistingAccounts(): void {
     if (!freshRegistry.providers[prov]) {
       freshRegistry.providers[prov] = discovered;
     } else {
-      // Merge accounts, preferring fresh registry's existing entries
+      // Merge accounts, preferring fresh registry's existing entries but updating projectId
       const freshProviderAccounts = freshRegistry.providers[prov];
       if (!freshProviderAccounts) continue;
       for (const [id, meta] of Object.entries(discovered.accounts)) {
@@ -720,6 +729,9 @@ export function discoverExistingAccounts(): void {
           if (!freshProviderAccounts.default || freshProviderAccounts.default === 'default') {
             freshProviderAccounts.default = id;
           }
+        } else if (meta.projectId && !freshProviderAccounts.accounts[id].projectId) {
+          // Update existing account with projectId if discovered from auth file
+          freshProviderAccounts.accounts[id].projectId = meta.projectId;
         }
       }
     }