Fix terminal echo: restore local command echoing in web terminal

- Add proper xterm.js configuration with disableStdin: false and other settings
- Implement local echo handling for printable characters, backspace, and enter
- Ensure terminal input is visible to user while maintaining server communication
- Fix input handling to properly display typed commands in the web interface

templates/terminal.html

@@ -62,7 +62,17 @@ function connect() {
             allowTransparency: true,
             scrollback: 1000,
             tabStopWidth: 4,
-            convertEol: true
+            convertEol: true,
+            disableStdin: false,
+            cursorWidth: 2,
+            bellStyle: 'none',
+            rightClickSelectsWord: true,
+            fastScrollModifier: 'alt',
+            fastScrollSensitivity: 5,
+            screenReaderMode: false,
+            macOptionIsMeta: false,
+            macOptionClickForcesSelection: false,
+            minimumContrastRatio: 1
         });
         term.open(document.getElementById('terminal'));
 
@@ -119,10 +129,22 @@ function connect() {
         disconnect();
     });
 
-    // Handle input - let SSH server handle echoing
+    // Handle input - send to server and handle local echo
     term.onData(data => {
         if (!connected || !requestId) return;
 
+        // Handle special characters for local echo
+        if (data === '\r' || data === '\n') {
+            // Enter key - let server handle the command execution
+            term.write('\r\n');
+        } else if (data === '\x7f' || data === '\b') {
+            // Backspace - handle locally
+            term.write('\b \b');
+        } else if (data >= ' ' && data <= '~') {
+            // Printable characters - echo locally
+            term.write(data);
+        }
+
         // Send data to server
         fetch('/terminal/{{ client_id }}/data', {
             method: 'POST',