fix: review fixes for style inference

- Fix hardcoded "default" accountId in Gmail fallback — now passes the
  real account ID so cached emails get the correct accountId
- Add error feedback to Learn My Style button — shows error message
  when inference fails instead of silently doing nothing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Ankit Gupta

src/main/ipc/settings.ipc.ts

@@ -581,9 +581,9 @@ export function registerSettingsIpc(): void {
       const syncService = getEmailSyncService();
       const { getAccounts: getDbAccounts } = await import("../db");
       const accounts = getDbAccounts();
-      const gmailClient =
-        accounts.length > 0 ? syncService.getClientForAccount(accounts[0].id) : null;
-      const result = await inferStyleFromSentEmails(gmailClient);
+      const firstAccountId = accounts.length > 0 ? accounts[0].id : undefined;
+      const gmailClient = firstAccountId ? syncService.getClientForAccount(firstAccountId) : null;
+      const result = await inferStyleFromSentEmails(gmailClient, firstAccountId);
       return { success: true, data: result };
     } catch (error) {
       return {

src/main/services/style-profiler.ts

@@ -381,7 +381,10 @@ Do NOT include example phrases or quoted text from the emails.`;
  * their writing style using Claude Opus. Returns a style description that
  * can be used as the stylePrompt.
  */
-export async function inferStyleFromSentEmails(gmailClient?: GmailClient | null): Promise<string> {
+export async function inferStyleFromSentEmails(
+  gmailClient?: GmailClient | null,
+  gmailAccountId?: string,
+): Promise<string> {
   // Fetch recent sent emails from local DB (all accounts)
   let emails = getRecentSentEmailsWithBody(100);
 
@@ -392,7 +395,7 @@ export async function inferStyleFromSentEmails(gmailClient?: GmailClient | null)
       const gmailRows = await fetchAndCacheSentEmails(
         gmailClient,
         "from:me in:sent",
-        "default",
+        gmailAccountId ?? "default",
         100,
       );
       // Merge, dedup by ID

src/renderer/components/SettingsPanel.tsx

@@ -480,6 +480,7 @@ export function SettingsPanel({ onClose, initialTab }: SettingsPanelProps) {
 
   const handleInferStyle = async () => {
     setIsInferring(true);
+    setSaveResult(null);
     try {
       const result = (await window.api.style.infer()) as {
         success: boolean;
@@ -488,7 +489,11 @@ export function SettingsPanel({ onClose, initialTab }: SettingsPanelProps) {
       };
       if (result.success && result.data) {
         setStylePrompt(result.data);
+      } else {
+        setSaveResult(result.error || "Failed to infer writing style");
       }
+    } catch {
+      setSaveResult("Failed to infer writing style");
     } finally {
       setIsInferring(false);
     }