feat(standalone): demo follow-ups — waitlist, analytics, move-to-local, file tree, load progress

- Waitlist signup form on the home page (between Projects and Tools),
  cross-posting to the landing site's /api/waitlist (CORS + OPTIONS added there,
  gated by WAITLIST_ALLOWED_ORIGINS).
- Version badge gains a pcbjam.com landing-page link (VITE_LANDING_URL).
- Optional Plausible analytics from VITE_PLAUSIBLE_DOMAIN (off by default);
  wired into build-demo + both deploy workflows via vars.PLAUSIBLE_DOMAIN.
- Opening a read-only gallery project auto-"moves to local": it forks into a
  writable browser-local project at the same slug, shadowing the gallery row.
- Project + local-folder views use the same iconed tool launcher (ToolGrid)
  and a navigable directory FileTree instead of a flat file list.
- Boot overlay shows real wasm download progress (Module.instantiateWasm +
  streaming byte counter) and a "taking too long" state after 60s.
- Home Libraries section lists the active libs source (the read-only R2/CDN
  set in the demo) with a name filter; useLibs now reads libsSourceConfig.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TPJYx4urFVhdMjEmYfMCMD

.github/workflows/deploy-demo.yml

@@ -89,9 +89,12 @@ jobs:
       #    full KiCad library set is served read-only from libs/kicad/$LIB_TAG
       #    (published once by publish-libs.yml — run it first for a new lib tag).
       - name: Build demo
+        # Plausible: set the repo Actions VARIABLE `PLAUSIBLE_DOMAIN` (e.g.
+        # demo.pcbjam.com) to enable analytics; unset ⇒ "" ⇒ build-demo leaves it off.
         run: >
           node scripts/deploy/build-demo.mjs --tag "${{ steps.tag.outputs.tag }}"
           --cdn "$CDN" --lib-tag "$LIB_TAG"
+          --plausible "${{ vars.PLAUSIBLE_DOMAIN }}"
 
       # 4) Ensure the Pages project exists (first deploy creates it; no-op after).
       #    Its production branch must equal PAGES_PROD_BRANCH or deploys land as

.github/workflows/release.yml

@@ -112,9 +112,12 @@ jobs:
       # Standalone pinned to the CDN + this tag's manifest-<tag>.json (written by
       # publish-wasm above) + the full library set at libs/kicad/$LIB_TAG.
       - name: Build demo
+        # Plausible: set the repo Actions VARIABLE `PLAUSIBLE_DOMAIN` (e.g.
+        # demo.pcbjam.com) to enable analytics; unset ⇒ "" ⇒ build-demo leaves it off.
         run: >
           node scripts/deploy/build-demo.mjs --tag "${{ needs.meta.outputs.tag }}"
           --cdn "$CDN" --lib-tag "$LIB_TAG"
+          --plausible "${{ vars.PLAUSIBLE_DOMAIN }}"
 
       - name: Ensure Pages project exists
         run: >