feat(claude-code): update to version 2.0.25

- Updated `@anthropic-ai/claude-code` package to version 2.0.25.
- Revised hashes in `package.nix` and `package-lock.json` for the new release.
- Added `writableTmpDirAsHomeHook` and `versionCheckHook` for install checks.
- Refined update script to use `--generate-lockfile` and handle unfree dependencies.

overlays/unstable/claude-code/package-lock.json

@@ -1,18 +1,12 @@
 {
-  "name": "claude-code",
-  "version": "1.0.17",
+  "name": "@anthropic-ai/claude-code",
+  "version": "2.0.25",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "dependencies": {
-        "@anthropic-ai/claude-code": "^2.0.21"
-      }
-    },
-    "node_modules/@anthropic-ai/claude-code": {
-      "version": "2.0.21",
-      "resolved": "https://registry.npmjs.org/@anthropic-ai/claude-code/-/claude-code-2.0.21.tgz",
-      "integrity": "sha512-02NcxPVjioLjo4/djzIt4aAYkYqnZsHgdzgMexLURYLR9q1+B+OLkKddKwOHL8fas3WnUGV1oyybu73BfHqQ4A==",
+      "name": "@anthropic-ai/claude-code",
+      "version": "2.0.25",
       "license": "SEE LICENSE IN README.md",
       "bin": {
         "claude": "cli.js"