Fix file path format and initialization issues

- Remove leading slash from file paths (use relative paths from workspace)
- Server expects relative paths like 'file.md' not '/file.md'
- Convert isInitialized from let to signal to persist across renders
- Fix file picker not showing files on first open
- Paths from find.files() are already relative to workspace

src/components/file-picker.tsx

@@ -22,6 +22,7 @@ const FilePicker: Component<FilePickerProps> = (props) => {
   const [selectedIndex, setSelectedIndex] = createSignal(0)
   const [loading, setLoading] = createSignal(false)
   const [cachedGitFiles, setCachedGitFiles] = createSignal<FileItem[]>([])
+  const [isInitialized, setIsInitialized] = createSignal(false)
 
   let containerRef: HTMLDivElement | undefined
   let gitFilesFetched = false
@@ -113,15 +114,14 @@ const FilePicker: Component<FilePickerProps> = (props) => {
   }
 
   let lastQuery = ""
-  let isInitialized = false
 
   createEffect(() => {
     console.log(
-      `[FilePicker] Effect triggered - open: ${props.open}, query: "${props.searchQuery}", gitFilesFetched: ${gitFilesFetched}, isInitialized: ${isInitialized}`,
+      `[FilePicker] Effect triggered - open: ${props.open}, query: "${props.searchQuery}", gitFilesFetched: ${gitFilesFetched}, isInitialized: ${isInitialized()}`,
     )
 
-    if (props.open && !isInitialized) {
-      isInitialized = true
+    if (props.open && !isInitialized()) {
+      setIsInitialized(true)
       console.log("[FilePicker] First open - fetching git files and initial files")
       fetchGitFiles()
       fetchFiles(props.searchQuery)

src/types/attachment.ts

@@ -53,17 +53,16 @@ export function createFileAttachment(
   mime: string = "text/plain",
   data?: Uint8Array,
 ): Attachment {
-  const absolutePath = path.startsWith("/") ? path : `/${path}`
   return {
     id: crypto.randomUUID(),
     type: "file",
     display: `@${filename}`,
-    url: `file://${absolutePath}`,
+    url: path,
     filename,
     mediaType: mime,
     source: {
       type: "file",
-      path: absolutePath,
+      path: path,
       mime,
       data,
     },