feat: Redesign FloatingTerminal with Windows Vista Aero style

- Slim, transparent Aero Glass design with backdrop blur
- Draggable window from titlebar
- Resizable from corner handle
- Ctrl+E toggle to open at cursor position
- Remove minimize functionality (close returns to sidebar button)
- Add PWA dev-dist files and lock files

server/bun.lock

@@ -0,0 +1,15 @@
+{
+  "lockfileVersion": 1,
+  "configVersion": 0,
+  "workspaces": {
+    "": {
+      "name": "agent-ui-server",
+      "dependencies": {
+        "@skitee3000/bun-pty": "^0.3.3",
+      },
+    },
+  },
+  "packages": {
+    "@skitee3000/bun-pty": ["@skitee3000/bun-pty@0.3.3", "", {}, "sha512-y+kA3435zkFjh11KdQMy0ho/UkKN/iae0t9tTE7iZ762Oi2h31dGOvbRIJWeJZ2qYYTJvAd6NEIzJlZUhI6ukw=="],
+  }
+}

server/package-lock.json

@@ -0,0 +1,31 @@
+{
+  "name": "agent-ui-server",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "agent-ui-server",
+      "version": "1.0.0",
+      "dependencies": {
+        "node-pty": "^1.1.0"
+      }
+    },
+    "node_modules/node-addon-api": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/node-addon-api/-/node-addon-api-7.1.1.tgz",
+      "integrity": "sha512-5m3bsyrjFWE1xf7nz7YXdN4udnVtXK6/Yfgn5qnahL6bCkf2yKt4k3nuTKAtT4r3IG8JNR2ncsIMdZuAzJjHQQ==",
+      "license": "MIT"
+    },
+    "node_modules/node-pty": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/node-pty/-/node-pty-1.1.0.tgz",
+      "integrity": "sha512-20JqtutY6JPXTUnL0ij1uad7Qe1baT46lyolh2sSENDd4sTzKZ4nmAFkeAARDKwmlLjPx6XKRlwRUxwjOy+lUg==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "dependencies": {
+        "node-addon-api": "^7.1.0"
+      }
+    }
+  }
+}