feat: harden plugin api for separate repos, signed updates and generic external login

plugins/serial/manifest.json

@@ -33,7 +33,8 @@
         "titleKey": "nav.serial",
         "icon": "Usb"
       }
-    ]
+    ],
+    "uses": ["terminal.resolveTheme"]
   },
   "desktop": "local"
 }

plugins/serial/package.json

@@ -6,13 +6,39 @@
   "scripts": {
     "build": "termix-plugin build",
     "test": "termix-plugin test",
-    "typecheck": "tsc -b ../../tsconfig.plugins.backend.json ../../tsconfig.plugins.frontend.json",
+    "typecheck": "tsc -p .",
     "validate": "termix-plugin validate"
   },
   "dependencies": {
+    "@xterm/addon-fit": "^0.11.0",
+    "@xterm/xterm": "^6.0.0",
+    "lucide-react": "^1.33.0",
+    "react-xtermjs": "^1.0.10",
     "serialport": "^13.0.0"
   },
   "devDependencies": {
-    "@termix/plugin-sdk": "*"
+    "@termix/plugin-sdk": "^1.0.0",
+    "@testing-library/dom": "^10.4.2",
+    "@testing-library/react": "^16.3.3",
+    "@types/node": "^26.2.0",
+    "@types/react": "^19.2.18",
+    "@types/react-dom": "^19.2.4",
+    "jsdom": "^30.0.1",
+    "vitest": "^4.1.11"
+  },
+  "peerDependencies": {
+    "@termix/plugin-sdk": "^1.0.0",
+    "react": "^19.2.8",
+    "ws": "^8.21.3"
+  },
+  "termix": {
+    "patches": [
+      "xterm-android-ime"
+    ]
+  },
+  "overrides": {
+    "react-xtermjs": {
+      "@xterm/xterm": "$@xterm/xterm"
+    }
   }
 }

plugins/serial/src/frontend/index.tsx

@@ -1,3 +1,5 @@
+// The terminal surfaces need xterm's own stylesheet.
+import "@xterm/xterm/css/xterm.css";
 import type { Ref } from "react";
 import { Usb } from "lucide-react";
 import type {