Fix empty query showing no files by showing git files only

- When query is empty, show only git files (no search)
- When query has text, search all files + git files
- Avoids server returning directories for empty query
- Simpler and faster UX for @ mentions

src/components/file-picker.tsx

@@ -100,21 +100,8 @@ const FilePicker: Component<FilePickerProps> = (props) => {
             isGitFile: false,
           }))
       } else {
-        console.log(`[FilePicker] Empty query, fetching all files`)
-        const searchResponse = await props.instanceClient.find.files({
-          query: { query: "" },
-        })
-        const elapsed = Date.now() - startTime
-
-        console.log(`[FilePicker] All files response received in ${elapsed}ms:`, searchResponse)
-
-        searchFiles = (searchResponse?.data || [])
-          .filter((path: string) => !path.endsWith("/"))
-          .filter((path: string) => !gitFiles.some((gf) => gf.path === path))
-          .map((path: string) => ({
-            path,
-            isGitFile: false,
-          }))
+        console.log(`[FilePicker] Empty query, showing only git files`)
+        searchFiles = []
       }
 
       const filteredGitFiles = searchQuery.trim()