Implement redirect with toast notification on profile save

- Add gotoHomeWithMessage function to navigationActions
- Redirect to home page after successful profile save
- Display success message in toast notification instead of in-form
- Check for profileSaved URL parameter on home page mount
- Clean up URL parameter after showing toast
- Move success message translation to home-page section
- Remove unused success state and message from AccountForm
- Remove useEffect import from AccountForm

User experience: After saving profile, users are redirected to the
familiar home screen and see a toast notification confirming the save.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/lib/actions/navigationActions.ts

@@ -9,6 +9,11 @@ export async function gotoHome({year, month}: YearMonth) {
     await gotoUrl(path);
 }
 
+export async function gotoHomeWithMessage(locale: string, message: string) {
+    const path = `/${locale}?${message}=true`;
+    await gotoUrl(path);
+}
+
 export async function gotoUrl(path: string) {
     console.log(path)
     revalidatePath(path, "page");