feat: add Node.js version warning, fix provider URL detection, and add v0.4.4 changelog (#146)

- Display persistent warning bar when Node.js version < 23
- Fix provider model fetching to support non-v1 API versions (e.g. /v4)
- Add v0.4.4 changelog entries to frontend
- Bump version to 0.4.4

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

packages/client/src/data/changelog.ts

@@ -5,6 +5,11 @@ export interface ChangelogEntry {
 }
 
 export const changelog: ChangelogEntry[] = [
+  {
+    version: '0.4.4',
+    date: '2026-04-23',
+    changes: ['changelog.new_0_4_4_1', 'changelog.new_0_4_4_2', 'changelog.new_0_4_4_3', 'changelog.new_0_4_4_4', 'changelog.new_0_4_4_5'],
+  },
   {
     version: '0.4.3',
     date: '2026-04-22',