fix: Windows Claude CLI path discovery and Extensions scroll

- Fix Windows Claude CLI not found when installed as .exe or without
  extension in .local\bin (closes #6). Now searches all extensions
  (.cmd, .exe, .bat, and bare) for every candidate directory.
- Fix Extensions/Skills list not scrollable when many items exist.
  Change content container to overflow-hidden so internal ScrollArea
  works correctly. Add overflow-auto to McpManager for its own scroll.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/extensions/page.tsx

@@ -40,7 +40,7 @@ function ExtensionsPageInner() {
           </TabsList>
         </Tabs>
       </div>
-      <div className="flex-1 overflow-auto p-6">
+      <div className="flex-1 overflow-hidden p-6">
         {tab === "skills" && <SkillsManager />}
         {tab === "mcp" && <McpManager />}
       </div>

src/components/plugins/McpManager.tsx

@@ -136,7 +136,7 @@ export function McpManager() {
   const serverCount = Object.keys(servers).length;
 
   return (
-    <div>
+    <div className="h-full overflow-auto">
       <div className="flex items-center justify-between mb-4">
         <div>
           <div className="flex items-center gap-2">

src/lib/platform.ts

@@ -53,13 +53,21 @@ export function getClaudeCandidatePaths(): string[] {
   if (isWindows) {
     const appData = process.env.APPDATA || path.join(home, 'AppData', 'Roaming');
     const localAppData = process.env.LOCALAPPDATA || path.join(home, 'AppData', 'Local');
-    return [
-      path.join(appData, 'npm', 'claude.cmd'),
-      path.join(localAppData, 'npm', 'claude.cmd'),
-      path.join(home, '.npm-global', 'bin', 'claude.cmd'),
-      path.join(home, '.claude', 'bin', 'claude.exe'),
-      path.join(home, '.local', 'bin', 'claude.cmd'),
+    const exts = ['.cmd', '.exe', '.bat', ''];
+    const baseDirs = [
+      path.join(appData, 'npm'),
+      path.join(localAppData, 'npm'),
+      path.join(home, '.npm-global', 'bin'),
+      path.join(home, '.claude', 'bin'),
+      path.join(home, '.local', 'bin'),
     ];
+    const candidates: string[] = [];
+    for (const dir of baseDirs) {
+      for (const ext of exts) {
+        candidates.push(path.join(dir, 'claude' + ext));
+      }
+    }
+    return candidates;
   }
   return [
     '/usr/local/bin/claude',