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

knip.json

@@ -0,0 +1,22 @@
+{
+  "$schema": "https://unpkg.com/knip@5/schema.json",
+  "tags": ["-lintignore"],
+  "entry": [
+    "src/main/index.ts",
+    "src/preload/index.ts",
+    "src/preload/trpc.ts",
+    "forge.config.ts",
+    "vite.main.config.mts",
+    "vite.preload.config.mts",
+    "vite.renderer.config.mts"
+  ],
+  "ignoreDependencies": [
+    "postcss",
+    "@electron-forge/shared-types",
+    "@milkdown/plugin-upload",
+    "@milkdown/prose"
+  ],
+  "ignore": [
+    "src/renderer/components/ui/**"
+  ]
+}