feat(web): create-mesh form + invite-link generator with QR code

- create-mesh-form: RHF + zod + shadcn Form. Fields name, slug (auto-
  derived from name, editable), visibility, transport. Slug validation
  matches server (lowercase letters, digits, hyphens). Slug collision
  errors surface on the slug field.
- invite-generator: RHF + zod. Fields role, maxUses, expiresInDays.
  After generation: renders the ic://join/... invite link as a 256px
  QR code (PNG data URL, Claude-palette colors) + copy-to-clipboard
  button + "claudemesh join <link>" snippet for teammates.

Add: qrcode 1.5.4 + @types/qrcode 1.5.5 (QR generation runs client-side).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/package.json

@@ -45,6 +45,7 @@
     "next-themes": "0.4.6",
     "nuqs": "2.7.2",
     "pdfjs-dist": "5.4.530",
+    "qrcode": "1.5.4",
     "react": "catalog:react19",
     "react-dom": "catalog:react19",
     "react-dropzone": "14.3.8",
@@ -67,6 +68,7 @@
     "@turbostarter/prettier-config": "workspace:*",
     "@turbostarter/tsconfig": "workspace:*",
     "@types/node": "catalog:node22",
+    "@types/qrcode": "1.5.6",
     "@types/react": "catalog:react19",
     "@types/react-dom": "catalog:react19",
     "autoprefixer": "10.4.21",