fix: SFTP preserves position on tab switch + CWD following on macOS

SFTP tab switch fix:
- Removed :key on FileTree that destroyed component on every switch
- useSftp now accepts a reactive Ref<string> sessionId
- Watches sessionId changes and reinitializes without destroying state
- Per-session path memory via sessionPaths map — switching back to a
  tab restores exactly where you were browsing

CWD following fix (macOS + all platforms):
- Injects OSC 7 prompt hook into the shell after SSH connect
- zsh: precmd() emits \e]7;file://host/path\e\\
- bash: PROMPT_COMMAND emits the same sequence
- Sent via the PTY channel so it configures the interactive shell
- The passive OSC 7 parser in the output loop picks it up
- SFTP sidebar auto-navigates to the current working directory

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src-tauri/src/ssh/session.rs

@@ -157,6 +157,23 @@ impl SshService {
         // Start remote monitoring if enabled (runs on a separate exec channel)
         crate::ssh::monitor::start_monitor(handle.clone(), app_handle.clone(), session_id.clone());
 
+        // Inject OSC 7 CWD reporting hook into the user's shell.
+        // This enables SFTP CWD following on all platforms (Linux, macOS, FreeBSD).
+        // Sent via the PTY channel so it configures the interactive shell.
+        {
+            let osc7_hook = concat!(
+                // Detect shell and inject the appropriate hook silently
+                r#"if [ -n "$ZSH_VERSION" ]; then "#,
+                r#"precmd() { printf '\033]7;file://%s%s\033\\' "$HOST" "$PWD"; }; "#,
+                r#"elif [ -n "$BASH_VERSION" ]; then "#,
+                r#"PROMPT_COMMAND='printf "\033]7;file://%s%s\033\\\\" "$HOSTNAME" "$PWD"'; "#,
+                r#"fi"#,
+                "\n"
+            );
+            let h = handle.lock().await;
+            let _ = h.data(channel_id, CryptoVec::from_slice(osc7_hook.as_bytes())).await;
+        }
+
         // Output reader loop — owns the Channel exclusively.
         // Writes go through Handle::data() so no shared mutex is needed.
         let sid = session_id.clone();

src/components/sftp/FileTree.vue

@@ -208,7 +208,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from "vue";
+import { ref, toRef } from "vue";
 import { invoke } from "@tauri-apps/api/core";
 import { useSftp, type FileEntry } from "@/composables/useSftp";
 import { useTransfers } from "@/composables/useTransfers";
@@ -221,7 +221,7 @@ const emit = defineEmits<{
   openFile: [entry: FileEntry];
 }>();
 
-const { currentPath, entries, isLoading, followTerminal, navigateTo, goUp, refresh } = useSftp(props.sessionId);
+const { currentPath, entries, isLoading, followTerminal, navigateTo, goUp, refresh } = useSftp(toRef(props, 'sessionId'));
 const { addTransfer, completeTransfer, failTransfer } = useTransfers();
 
 /** Currently selected entry (single-click to select, double-click to open/navigate). */

src/composables/useSftp.ts

@@ -1,4 +1,4 @@
-import { ref, onBeforeUnmount, type Ref } from "vue";
+import { ref, watch, onBeforeUnmount, type Ref } from "vue";
 import { invoke } from "@tauri-apps/api/core";
 import { listen, type UnlistenFn } from "@tauri-apps/api/event";
 
@@ -21,20 +21,24 @@ export interface UseSftpReturn {
   refresh: () => Promise<void>;
 }
 
+// Persist the last browsed path per session so switching tabs restores position
+const sessionPaths: Record<string, string> = {};
+
 /**
  * Composable that manages SFTP file browsing state.
- * Calls the Rust SFTP commands via Tauri invoke.
+ * Accepts a reactive session ID ref so it reinitializes on tab switch
+ * without destroying the component.
  */
-export function useSftp(sessionId: string): UseSftpReturn {
+export function useSftp(sessionIdRef: Ref<string>): UseSftpReturn {
   const currentPath = ref("/");
   const entries = ref<FileEntry[]>([]);
   const isLoading = ref(false);
   const followTerminal = ref(true);
 
-  // Holds the unlisten function returned by listen() — called on cleanup.
   let unlistenCwd: UnlistenFn | null = null;
+  let currentSessionId = "";
 
-  async function listDirectory(path: string): Promise<FileEntry[]> {
+  async function listDirectory(sessionId: string, path: string): Promise<FileEntry[]> {
     try {
       const result = await invoke<FileEntry[]>("sftp_list", { sessionId, path });
       return result ?? [];
@@ -45,10 +49,12 @@ export function useSftp(sessionId: string): UseSftpReturn {
   }
 
   async function navigateTo(path: string): Promise<void> {
+    if (!currentSessionId) return;
     isLoading.value = true;
     try {
       currentPath.value = path;
-      entries.value = await listDirectory(path);
+      sessionPaths[currentSessionId] = path;
+      entries.value = await listDirectory(currentSessionId, path);
     } finally {
       isLoading.value = false;
     }
@@ -68,25 +74,63 @@ export function useSftp(sessionId: string): UseSftpReturn {
     await navigateTo(currentPath.value);
   }
 
-  // Listen for CWD changes from the Rust backend (OSC 7 tracking).
-  // listen() returns Promise<UnlistenFn> — store it for cleanup.
-  listen<string>(`ssh:cwd:${sessionId}`, (event) => {
-    if (!followTerminal.value) return;
-    const newPath = event.payload;
-    if (newPath && newPath !== currentPath.value) {
-      navigateTo(newPath);
+  async function switchToSession(sessionId: string): Promise<void> {
+    if (!sessionId) {
+      entries.value = [];
+      return;
     }
-  }).then((unlisten) => {
-    unlistenCwd = unlisten;
-  });
+
+    // Save current path for the old session
+    if (currentSessionId) {
+      sessionPaths[currentSessionId] = currentPath.value;
+    }
+
+    // Unlisten old CWD events
+    if (unlistenCwd) {
+      unlistenCwd();
+      unlistenCwd = null;
+    }
+
+    currentSessionId = sessionId;
+
+    // Restore saved path or default to /home
+    const savedPath = sessionPaths[sessionId] || "/home";
+    currentPath.value = savedPath;
+
+    // Load the directory
+    isLoading.value = true;
+    try {
+      entries.value = await listDirectory(sessionId, savedPath);
+    } finally {
+      isLoading.value = false;
+    }
+
+    // Listen for CWD changes on the new session
+    try {
+      unlistenCwd = await listen<string>(`ssh:cwd:${sessionId}`, (event) => {
+        if (!followTerminal.value) return;
+        const newPath = event.payload;
+        if (newPath && newPath !== currentPath.value) {
+          navigateTo(newPath);
+        }
+      });
+    } catch {
+      // Event listener setup failed — non-fatal
+    }
+  }
+
+  // React to session ID changes
+  watch(sessionIdRef, (newId) => {
+    switchToSession(newId);
+  }, { immediate: true });
 
   onBeforeUnmount(() => {
+    if (currentSessionId) {
+      sessionPaths[currentSessionId] = currentPath.value;
+    }
     if (unlistenCwd) unlistenCwd();
   });
 
-  // Load home directory on init
-  navigateTo("/home");
-
   return {
     currentPath,
     entries,

src/layouts/MainLayout.vue

@@ -215,7 +215,6 @@
           <template v-else-if="sidebarTab === 'sftp'">
             <template v-if="activeSessionId">
               <FileTree
-                :key="activeSessionId"
                 :session-id="activeSessionId"
                 class="flex-1 min-h-0"
                 @open-file="handleOpenFile"