fix: use server home path for session listing to show all projects

When no project directory is explicitly selected, the session list was
filtered to the server's CWD, hiding sessions from other projects.

Fix by using the server's home path (fetched from /path) as the
x-opencode-directory header when listing sessions without an explicit
project directory. This ensures recent sessions across all projects
appear in the list.

src/stores/sessions.ts

@@ -73,15 +73,22 @@ export const useSessions = create<SessionsState>((set, get) => ({
   error: null,
 
   loadSessions: async () => {
-    const client = useConnections.getState().client
-    if (!client) {
+    const connState = useConnections.getState()
+    if (!connState.client) {
       set({ error: "No active connection" })
       return
     }
 
+    // When no project directory is explicitly selected, use the server home path so the
+    // session list shows all recent sessions across all projects — not just the server's CWD.
+    const listClient =
+      !connState.activeConnection?.directory && connState.serverHome
+        ? connState.clientForDirectory(connState.serverHome)
+        : connState.client
+
     try {
       set({ isLoading: true, error: null })
-      const sessions = await client.session.list({ roots: true, limit: 50 })
+      const sessions = await (listClient || connState.client).session.list({ roots: true, limit: 50 })
       set({ sessions, isLoading: false })
     } catch (error) {
       set({ error: "Failed to load sessions", isLoading: false })