feat: tema ayarları Appwrite user prefs ile kalıcı hale getirildi

- saveThemePrefsAction: account.updatePrefs ile mevcut prefs'i merge eder
- Dashboard layout'ta account.getPrefs ile prefs server-side yüklenir
- PrefsInitializer: mount'ta dark/light, renk teması, radius, sidebar
  config'ini Appwrite'dan gelen initialPrefs ile uygular
- ThemeCustomizer: renk teması / tweakcn / radius / sidebar değişikliği
  anında Appwrite'a kaydedilir; dark/light toggle useEffect ile izlenir
- Sayfa yenileme ve farklı cihazda giriş sonrasında ayarlar korunur

src/app/(dashboard)/dashboard-shell.tsx

@@ -7,7 +7,9 @@ import { SiteHeader } from "@/components/site-header";
 import { SiteFooter } from "@/components/site-footer";
 import { SidebarProvider, SidebarInset } from "@/components/ui/sidebar";
 import { ThemeCustomizer, ThemeCustomizerTrigger } from "@/components/theme-customizer";
+import { PrefsInitializer } from "@/components/theme-customizer/prefs-initializer";
 import { useSidebarConfig } from "@/hooks/use-sidebar-config";
+import type { ThemePrefs } from "@/lib/appwrite/theme-prefs-actions";
 
 export type ShellUser = {
   id: string;
@@ -25,10 +27,12 @@ export function DashboardShell({
   user,
   company,
   children,
+  initialPrefs,
 }: {
   user: ShellUser;
   company: ShellCompany;
   children: React.ReactNode;
+  initialPrefs: ThemePrefs;
 }) {
   const [themeCustomizerOpen, setThemeCustomizerOpen] = React.useState(false);
   const { config } = useSidebarConfig();
@@ -44,6 +48,8 @@ export function DashboardShell({
       }
       className={config.collapsible === "none" ? "sidebar-none-mode" : ""}
     >
+      <PrefsInitializer prefs={initialPrefs} />
+
       {config.side === "left" ? (
         <>
           <AppSidebar
@@ -88,6 +94,7 @@ export function DashboardShell({
       <ThemeCustomizer
         open={themeCustomizerOpen}
         onOpenChange={setThemeCustomizerOpen}
+        initialPrefs={initialPrefs}
       />
     </SidebarProvider>
   );

src/app/(dashboard)/layout.tsx

@@ -2,6 +2,8 @@ import { redirect } from "next/navigation";
 
 import { getActiveContext } from "@/lib/appwrite/active-context";
 import { getLogoUrl } from "@/lib/appwrite/storage";
+import { createSessionClient } from "@/lib/appwrite/server";
+import type { ThemePrefs } from "@/lib/appwrite/theme-prefs-actions";
 import { DashboardShell } from "./dashboard-shell";
 
 export default async function DashboardLayout({
@@ -12,6 +14,14 @@ export default async function DashboardLayout({
   const ctx = await getActiveContext();
   if (!ctx) redirect("/onboarding");
 
+  let themePrefs: ThemePrefs = {};
+  try {
+    const { account } = await createSessionClient();
+    themePrefs = await account.getPrefs<ThemePrefs>();
+  } catch {
+    // use defaults if prefs unavailable
+  }
+
   const company = {
     id: ctx.tenantId,
     name: ctx.settings?.officeName ?? "Çalışma alanı",
@@ -24,7 +34,7 @@ export default async function DashboardLayout({
   };
 
   return (
-    <DashboardShell user={user} company={company}>
+    <DashboardShell user={user} company={company} initialPrefs={themePrefs}>
       {children}
     </DashboardShell>
   );