style: auto-fix ESLint issues (curly braces and formatting)

- Add curly braces to all if/else/for/while statements
- Fix indentation and trailing spaces
- Auto-fixed 372 linting errors using eslint --fix
- Remaining issues are warnings only (non-null assertions, explicit any types)

src/automation/gmail.ts

@@ -212,7 +212,7 @@ export class GmailWatcher implements ChannelAdapter {
    * Calls gmail.users.watch() and schedules renewal before expiry.
    */
   private async setupWatch(): Promise<void> {
-    if (!this.oauth2Client) return;
+    if (!this.oauth2Client) {return;}
 
     const gmail = google.gmail({ version: 'v1', auth: this.oauth2Client });
 
@@ -243,7 +243,7 @@ export class GmailWatcher implements ChannelAdapter {
    * Fallback mechanism when Pub/Sub push is not available.
    */
   private async pollForNewMessages(): Promise<void> {
-    if (!this.oauth2Client) return;
+    if (!this.oauth2Client) {return;}
 
     const gmail = google.gmail({ version: 'v1', auth: this.oauth2Client });
 
@@ -268,7 +268,7 @@ export class GmailWatcher implements ChannelAdapter {
    * Updates lastHistoryId to the latest value from the response.
    */
   private async processHistoryChanges(startHistoryId: string): Promise<void> {
-    if (!this.oauth2Client) return;
+    if (!this.oauth2Client) {return;}
 
     const gmail = google.gmail({ version: 'v1', auth: this.oauth2Client });
 
@@ -287,17 +287,17 @@ export class GmailWatcher implements ChannelAdapter {
         const addedMessages = record.messagesAdded ?? [];
         for (const added of addedMessages) {
           const messageId = added.message?.id;
-          if (!messageId || processedIds.has(messageId)) continue;
+          if (!messageId || processedIds.has(messageId)) {continue;}
           processedIds.add(messageId);
 
           const email = await this.getMessageDetails(messageId);
-          if (!email) continue;
+          if (!email) {continue;}
 
           // Skip messages before history_start if configured
           if (this.config.history_start) {
             const emailDate = new Date(email.date);
             const startDate = new Date(this.config.history_start);
-            if (emailDate < startDate) continue;
+            if (emailDate < startDate) {continue;}
           }
 
           const text = this.renderTemplate(email);
@@ -348,7 +348,7 @@ export class GmailWatcher implements ChannelAdapter {
    * Fetch full message details by ID and extract relevant headers.
    */
   private async getMessageDetails(messageId: string): Promise<EmailInfo | null> {
-    if (!this.oauth2Client) return null;
+    if (!this.oauth2Client) {return null;}
 
     const gmail = google.gmail({ version: 'v1', auth: this.oauth2Client });