feat: add knip configuration file and integrate knip for linting; update package.json and package-lock.json for new dependencies; refactor various interfaces to remove export modifiers; delete unused hover-card component

package.json

@@ -10,7 +10,8 @@
     "package": "electron-forge package",
     "make": "electron-forge make",
     "publish": "electron-forge publish",
-    "lint": "eslint --ext .ts,.tsx ."
+    "lint": "eslint --ext .ts,.tsx .",
+    "knip": "knip"
   },
   "keywords": [],
   "author": "rmusso",
@@ -28,6 +29,7 @@
     "@tanstack/router-vite-plugin": "^1.161.1",
     "@types/better-sqlite3": "^7.6.13",
     "@types/electron-squirrel-startup": "^1.0.2",
+    "@types/node": "^25.3.3",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@typescript-eslint/eslint-plugin": "^5.62.0",
@@ -38,6 +40,7 @@
     "eslint": "^8.57.1",
     "eslint-import-resolver-typescript": "^4.4.4",
     "eslint-plugin-import": "^2.32.0",
+    "knip": "^5.85.0",
     "postcss": "^8.5.6",
     "shadcn": "^3.8.5",
     "tailwindcss": "^4.2.0",
@@ -53,7 +56,6 @@
     "@langchain/langgraph": "^1.1.5",
     "@langchain/openai": "^1.2.9",
     "@milkdown/crepe": "^7.18.0",
-    "@milkdown/kit": "^7.18.0",
     "@tailwindcss/typography": "^0.5.19",
     "@tailwindcss/vite": "^4.2.0",
     "@tanstack/react-query": "^5.90.21",