feat: MobaXTerm-style clipboard — select to copy, right-click to paste

Highlight text auto-copies to clipboard via onSelectionChange. Right-click
on terminal pastes from clipboard by writing to SSH stdin. Disables
xterm.js default right-click word-select behavior.

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

frontend/src/composables/useTerminal.ts

@@ -66,6 +66,7 @@ export function useTerminal(sessionId: string): UseTerminalReturn {
     scrollback: 10000,
     allowProposedApi: true,
     convertEol: true,
+    rightClickSelectsWord: false,
   });
 
   terminal.loadAddon(fitAddon);
@@ -86,6 +87,24 @@ export function useTerminal(sessionId: string): UseTerminalReturn {
     });
   });
 
+  // MobaXTerm-style clipboard: highlight to copy, right-click to paste
+  const selectionDisposable = terminal.onSelectionChange(() => {
+    const sel = terminal.getSelection();
+    if (sel) {
+      navigator.clipboard.writeText(sel).catch(() => {});
+    }
+  });
+
+  function handleRightClickPaste(e: MouseEvent): void {
+    e.preventDefault();
+    e.stopPropagation();
+    navigator.clipboard.readText().then((text) => {
+      if (text) {
+        Call.ByName(`${SSH}.Write`, sessionId, text).catch(() => {});
+      }
+    }).catch(() => {});
+  }
+
   // Listen for SSH output events from the Go backend (base64 encoded)
   let cleanupEvent: (() => void) | null = null;
 
@@ -121,6 +140,9 @@ export function useTerminal(sessionId: string): UseTerminalReturn {
     terminal.open(container);
     fitAddon.fit();
 
+    // Right-click paste on the terminal's DOM element
+    terminal.element?.addEventListener("contextmenu", handleRightClickPaste);
+
     // Subscribe to SSH output events for this session
     // Wails v3 Events.On callback receives a CustomEvent object with .data property
     cleanupEvent = Events.On(`ssh:data:${sessionId}`, (event: any) => {
@@ -175,6 +197,8 @@ export function useTerminal(sessionId: string): UseTerminalReturn {
       terminal.write(pendingData);
       pendingData = "";
     }
+    terminal.element?.removeEventListener("contextmenu", handleRightClickPaste);
+    selectionDisposable.dispose();
     if (cleanupEvent) {
       cleanupEvent();
       cleanupEvent = null;