Use new dyad icons (#1157)

<!-- This is an auto-generated description by cubic. -->

## Summary by cubic
Updates app branding to icon set v2 and switches the in-app logo to SVG
for sharper rendering.

- **Refactors**
  - Use assets/logo.svg in TitleBar instead of logo_transparent.png.
- Add assets/logo.svg; remove legacy PNGs (logo.png,
logo_transparent.png).
- Refresh platform icon files (logo.icns, logo.ico,
assets/icon/logo.png).

<!-- End of auto-generated description by cubic. -->

assets/logo.svg

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src/app/TitleBar.tsx

@@ -5,7 +5,7 @@ import { useRouter, useLocation } from "@tanstack/react-router";
 import { useSettings } from "@/hooks/useSettings";
 import { Button } from "@/components/ui/button";
 // @ts-ignore
-import logo from "../../assets/logo_transparent.png";
+import logo from "../../assets/logo.svg";
 import { providerSettingsRoute } from "@/routes/settings/providers/$provider";
 import { cn } from "@/lib/utils";
 import { useDeepLink } from "@/contexts/DeepLinkContext";