- Added scope-aware Gmail status via gmail:getConnectionStatus, so the email empty state can

distinguish “not connected” from “connected but missing new Gmail scope.”
  - Hardened Gmail send header construction against CR/LF header injection.
  - Switched MIME parts from invalid UTF-8 7bit bodies to base64-encoded UTF-8 parts.
  - Made forward send as a new message instead of attaching it to the original thread, and included
    forwarded message content.
  - Changed archive/delete UI behavior to remove the thread only after Gmail confirms success.

apps/x/packages/shared/src/ipc.ts

@@ -150,7 +150,7 @@ const ipcSchemas = {
   },
   'gmail:sendReply': {
     req: z.object({
-      threadId: z.string().min(1),
+      threadId: z.string().min(1).optional(),
       to: z.string().min(1),
       cc: z.string().optional(),
       bcc: z.string().optional(),
@@ -165,6 +165,15 @@ const ipcSchemas = {
       error: z.string().optional(),
     }),
   },
+  'gmail:getConnectionStatus': {
+    req: z.object({}),
+    res: z.object({
+      connected: z.boolean(),
+      hasRequiredScope: z.boolean(),
+      missingScopes: z.array(z.string()),
+      email: z.string().nullable(),
+    }),
+  },
   'gmail:getAccountEmail': {
     req: z.object({}),
     res: z.object({