feat: add latency indicator and broadcast target selection

- Added a latency indicator to the status bar, displaying round-trip time for SSH sessions.
- Implemented functionality to select specific sessions for broadcasting input, allowing users to manage broadcast targets.
- Enhanced SFTP functionality with bookmark management, enabling users to bookmark directories and navigate to them easily.
- Introduced a modal for user-defined snippet variables, allowing dynamic command execution with placeholders.
- Added port forwarding management for SSH sessions, including the ability to start and stop port forwards.
- Improved terminal output export functionality, allowing users to download or copy terminal output to clipboard.

frontend/src/js/tabs.js

@@ -116,10 +116,17 @@
         this.app.sidebar.highlightActive(session.profileId);
       }
 
-      // Fit the terminal for the newly active session
-      this.app.terminals.fitActive();
+      // Fit and refresh the terminal for the newly active session.
+      // Double-RAF ensures the panel has layout dimensions before fitting.
       requestAnimationFrame(() => {
-        this.app.terminals.focusTerminal(sessionId);
+        this.app.terminals.fitSession(sessionId);
+        const entry = this.app.terminals.terminals.get(sessionId);
+        if (entry) {
+          entry.term.refresh(0, entry.term.rows - 1);
+        }
+        requestAnimationFrame(() => {
+          this.app.terminals.focusTerminal(sessionId);
+        });
       });
     }