feat: redraw the app icon on a white tile with shorter bottom boxes (#985)

* feat: redraw the app icon on a white tile with shorter bottom boxes

Same org chart shape as before, redrawn as a vector so edges are sharp.
The white tile keeps the icon visible on dark docks, taskbars and tabs,
so dark mode now uses the same image and favicon-white.svg is removed.
The desktop icon is now 1024x1024.

* chore: add SVG sources for the app icon and favicons

resources/icon.svg renders resources/icon.png; resources/favicon.svg renders
the favicon .ico and .png files.

* fix: add a title to the icon SVG sources for the Biome a11y check

components/workspace/brand-mark.tsx

@@ -3,7 +3,7 @@
 import { getAssetUrl } from "@/lib/base-path"
 import { cn } from "@/lib/utils"
 
-/** The app icon in a rounded tile; the white variant is used in dark mode */
+/** The app icon in a rounded tile; the icon has its own white tile, so dark mode uses it too */
 export function BrandMark({ className }: { className?: string }) {
     return (
         <span
@@ -16,13 +16,7 @@ export function BrandMark({ className }: { className?: string }) {
             <img
                 src={getAssetUrl("/favicon-192x192.png")}
                 alt=""
-                className="size-full object-contain dark:hidden"
-            />
-            {/* biome-ignore lint/performance/noImgElement: tiny static icon */}
-            <img
-                src={getAssetUrl("/favicon-white.svg")}
-                alt=""
-                className="hidden size-5 object-contain dark:block"
+                className="size-full object-contain"
             />
         </span>
     )