Fix case-study share chrome, hero lockup width, and copy confirmation in the share dialog.

Marketing pages omitted create-flow nav copy, so Share rendered as a translation key; the case-study banner squeezed hero text to the thumbnail width; Copy link had no hover or copied state.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/assetUtils.ts

@@ -86,7 +86,13 @@ export function partnerLogoPath(slug: string): string {
 }
 
 /** Share modal glyphs in `public/assets/share/`. */
-export type ShareIconName = "discord" | "link" | "mail" | "signal" | "slack";
+export type ShareIconName =
+  | "check"
+  | "discord"
+  | "link"
+  | "mail"
+  | "signal"
+  | "slack";
 
 export function shareIconPath(name: ShareIconName): string {
   return `assets/share/${name}.svg`;