feat: add meeting creation and dashboard with join links

Adds the management/CRUD layer for meetings: a signed JWT join-link
token service (jose), instant/scheduled meeting creation endpoints,
and a protected /dashboard page listing the host's active, upcoming,
and past meetings with a "Nueva reunión" action area (instant button +
scheduling dialog). Also fixes a Base UI console warning (missing
nativeButton={false}) on Button instances rendered as Link.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bun.lock

@@ -12,6 +12,7 @@
         "bcryptjs": "^3.0.3",
         "class-variance-authority": "^0.7.1",
         "cn": "^0.5.0",
+        "jose": "^6.2.14",
         "lucide-react": "^1.64.0",
         "next": "16.4.3",
         "next-auth": "^5.0.0-beta.32",