perf: speed up desktop startup and unify theme-aware branding (#596)

* fix: unify startup logo and loading theme behavior

Show desktop window immediately with animated splash logo
Align splash/logo colors with selected app theme and default themes
Keep auth loading state on full-screen logo without size jump
Make project SVG icons follow active app theme
Use the active theme foreground color for project icons discovered from favicons
Apply server-side SVG color overrides for currentColor icons via icon request params
Keep non-SVG project icons unchanged while preserving existing fallback behavior

* perf: speed up desktop startup and unify loading logo visuals

Desktop startup now shows UI sooner while backend boot continues in background
Startup host probing uses a faster local path with safer remote fallback retries
OpenChamber logo cube highlights now match splash screens consistently

* fix: keep macOS traffic-light buttons in the correct position on load

Stop native window title updates on macOS during app initialization
Prevent title bar relayout that reset custom traffic-light positioning

* fix: recover missing providers and agents after fast startup

Retries provider/agent loading when connection is up but core config is still empty
Prevents cold-start state where models/agents appear only after manual project switch
Keeps startup responsive with throttled background recovery in app bootstrap

packages/ui/src/hooks/useWindowTitle.ts

@@ -113,6 +113,12 @@ export const useWindowTitle = () => {
         if (cancelled) {
           return;
         }
+
+        const isMac = typeof navigator !== 'undefined' && /Macintosh|Mac OS X/.test(navigator.userAgent || '');
+        if (isMac) {
+          return;
+        }
+
         const currentWindow = getCurrentWindow();
         await currentWindow.setTitle(title);
       } catch {