refactor: rename marketplace to workshop, add colored type dots

Rename all user-facing "Marketplace" references to "Workshop" including
the route (/workshop), navbar label, page titles, button labels, env vars,
docs, and error messages. The PocketBase view collection stays `marketplace`
as an internal API detail.

Replace icon-based type badges with colored dots (blue = CSS, yellow = widget)
on both the filter bar and submission cards for clearer visual distinction.

apps/docs/src/components/store/useStore.ts

@@ -58,7 +58,7 @@ export const useStore = (storeUrl: string) => {
       );
       await refreshVotes();
     } catch (caught) {
-      setError(errorMessage(caught, "Failed to load the marketplace"));
+      setError(errorMessage(caught, "Failed to load the workshop"));
     } finally {
       setLoading(false);
     }