Fix: Reset invalid accounts on startup and improve project discovery logging

Fixes #33 - Accounts marked as invalid were permanently stuck because
the isInvalid flag was persisted to disk but never reset on startup.

Changes:
- Reset isInvalid flag for all accounts on server startup, giving them
  a fresh chance to refresh their OAuth tokens
- Add logging for project discovery failures (was silently failing)
- Add success logging when project is discovered
- Add warning message when falling back to default project

Bug introduced in 01cda83 (2025-12-25) when isInvalid persistence was
added without corresponding reset logic on load.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/account-manager/credentials.js

@@ -123,14 +123,20 @@ export async function discoverProject(token) {
                 })
             });
 
-            if (!response.ok) continue;
+            if (!response.ok) {
+                const errorText = await response.text();
+                logger.warn(`[AccountManager] Project discovery failed at ${endpoint}: ${response.status} - ${errorText}`);
+                continue;
+            }
 
             const data = await response.json();
 
             if (typeof data.cloudaicompanionProject === 'string') {
+                logger.success(`[AccountManager] Discovered project: ${data.cloudaicompanionProject}`);
                 return data.cloudaicompanionProject;
             }
             if (data.cloudaicompanionProject?.id) {
+                logger.success(`[AccountManager] Discovered project: ${data.cloudaicompanionProject.id}`);
                 return data.cloudaicompanionProject.id;
             }
         } catch (error) {
@@ -138,7 +144,8 @@ export async function discoverProject(token) {
         }
     }
 
-    logger.info(`[AccountManager] Using default project: ${DEFAULT_PROJECT_ID}`);
+    logger.warn(`[AccountManager] Project discovery failed for all endpoints. Using default project: ${DEFAULT_PROJECT_ID}`);
+    logger.warn(`[AccountManager] If you see 404 errors, your account may not have Gemini Code Assist enabled.`);
     return DEFAULT_PROJECT_ID;
 }
 

src/account-manager/storage.js

@@ -28,7 +28,10 @@ export async function loadAccounts(configPath = ACCOUNT_CONFIG_PATH) {
             ...acc,
             isRateLimited: acc.isRateLimited || false,
             rateLimitResetTime: acc.rateLimitResetTime || null,
-            lastUsed: acc.lastUsed || null
+            lastUsed: acc.lastUsed || null,
+            // Reset invalid flag on startup - give accounts a fresh chance to refresh
+            isInvalid: false,
+            invalidReason: null
         }));
 
         const settings = config.settings || {};