feat: onboarding trial flow, Google sign-in, dark mode hotspot fixes

- Move trial creation from auth hook to dedicated /subscriptions/trial endpoint
  with eligibility checks (3-day Full Paket trial)
- Add animated onboarding progress (Remotion) with confetti on completion
- Register redirects to subscription page with welcome flow
- Add Google social login/signup support with config injection
- Improve hotspot overlay visibility in dark mode
- Show "Panele Git" on landing page when authenticated
- Turkish translations for API error messages
- Add toast utility wrapper, UUID generation for auth IDs

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

apps/web/src/lib/api-client.ts

@@ -30,7 +30,7 @@ class ApiClient {
 
     if (!res.ok) {
       throw new ApiError(
-        data?.error?.message || "Request failed",
+        data?.error?.message || "İstek başarısız",
         data?.error?.code || "UNKNOWN",
         res.status,
       );
@@ -66,7 +66,7 @@ class ApiClient {
 
     if (!res.ok) {
       throw new ApiError(
-        data?.error?.message || "Upload failed",
+        data?.error?.message || "Yükleme başarısız",
         data?.error?.code || "UNKNOWN",
         res.status,
       );

apps/web/src/lib/toast.ts

@@ -0,0 +1,25 @@
+import { sileo } from "sileo";
+export { Toaster } from "sileo";
+
+interface ToastOptions {
+  description?: string;
+  duration?: number;
+  position?:
+    | "top-left"
+    | "top-center"
+    | "top-right"
+    | "bottom-left"
+    | "bottom-center"
+    | "bottom-right";
+}
+
+export const toast = {
+  success: (title: string, opts?: ToastOptions) =>
+    sileo.success({ title, ...opts }),
+  error: (title: string, opts?: ToastOptions) =>
+    sileo.error({ title, ...opts }),
+  info: (title: string, opts?: ToastOptions) =>
+    sileo.info({ title, ...opts }),
+  warning: (title: string, opts?: ToastOptions) =>
+    sileo.warning({ title, ...opts }),
+};