Fix shared-identifier issues in verify and re-auth hint

1. verify: use findGmailSource() instead of GetSourceByIdentifier()
   to avoid counting the wrong archive when Gmail and mbox/imap
   sources share the same identifier.

2. re-auth hint: include --type gmail in the remove-account
   suggestion since the identifier may be shared across source types.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: wesm

cmd/msgvault/cmd/addaccount.go

@@ -143,17 +143,23 @@ Examples:
 	},
 }
 
-func hasGmailSource(s *store.Store, email string) bool {
+func findGmailSource(
+	s *store.Store, email string,
+) *store.Source {
 	sources, err := s.GetSourcesByIdentifier(email)
 	if err != nil {
-		return false
+		return nil
 	}
 	for _, src := range sources {
 		if src.SourceType == "gmail" {
-			return true
+			return src
 		}
 	}
-	return false
+	return nil
+}
+
+func hasGmailSource(s *store.Store, email string) bool {
+	return findGmailSource(s, email) != nil
 }
 
 func init() {

cmd/msgvault/cmd/root.go

@@ -217,7 +217,7 @@ func getTokenSourceWithReauth(
 				"re-authorize %s: %w\n"+
 					"If this account uses an alias, remove "+
 					"and re-add with the primary address:\n"+
-					"  msgvault remove-account %s\n"+
+					"  msgvault remove-account %s --type gmail\n"+
 					"  msgvault add-account %s",
 				email, authErr,
 				mismatch.Expected, mismatch.Actual,

cmd/msgvault/cmd/verify.go

@@ -87,16 +87,14 @@ Examples:
 
 		fmt.Printf("Verifying archive for %s...\n\n", profile.EmailAddress)
 
-		// Look up the source by the user-supplied identifier, not the
-		// canonical profile address — the source is keyed under the
-		// identifier used during add-account (e.g. first.last@gmail.com
-		// even if Gmail's canonical form is firstlast@gmail.com).
-		source, err := s.GetSourceByIdentifier(email)
-		if err != nil {
-			return fmt.Errorf("get source: %w", err)
-		}
+		// Look up the Gmail source by the user-supplied identifier,
+		// not the canonical profile address — the source is keyed
+		// under the identifier from add-account. Filter to Gmail
+		// specifically since the same identifier may exist for
+		// other source types (mbox, imap).
+		source := findGmailSource(s, email)
 		if source == nil {
-			fmt.Printf("Account %s not found in database.\n", email)
+			fmt.Printf("Gmail account %s not found in database.\n", email)
 			fmt.Println("Run 'sync-full' first to populate the archive.")
 			return nil
 		}