fix: add deleted_at column to mail_sync_queue — process_sync_queue was crashing

- MailSyncQueue inherits TenantMixin which includes SoftDeleteMixin (deleted_at)
- Migration 0007 did not create this column
- process_sync_queue crashed on every auto-sync attempt
- Add migration 0008 to add deleted_at column
- Bump plugin version to 1.3.0

app/plugins/builtins/mail/migrations/0008_sync_queue_deleted_at.sql

@@ -0,0 +1,3 @@
+-- Fix: MailSyncQueue inherits TenantMixin which includes SoftDeleteMixin (deleted_at)
+-- Migration 0007 did not include this column, causing process_sync_queue to crash
+ALTER TABLE mail_sync_queue ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;

app/plugins/builtins/mail/plugin.py

@@ -39,7 +39,7 @@ class MailPlugin(BasePlugin):
 
     manifest = PluginManifest(
         name="mail",
-        version="1.2.0",
+        version="1.3.0",
         display_name="Mail",
         description=(
             "Email management: IMAP sync, SMTP send, threading, "
@@ -54,7 +54,7 @@ class MailPlugin(BasePlugin):
             ),
         ],
         events=[],
-        migrations=["0001_initial.sql", "0006_flag_type.sql", "0007_sync_queue.sql"],
+        migrations=["0001_initial.sql", "0006_flag_type.sql", "0007_sync_queue.sql", "0008_sync_queue_deleted_at.sql"],
         permissions=["mail:read", "mail:send", "mail:config", "mail:share", "mail:write", "mail:delete"],
     )