feat(terminal): add Cmd+Arrow and Shift+Enter keyboard shortcuts (#39)

* feat(terminal): add Cmd+Arrow and Shift+Enter keyboard shortcuts

- Cmd+Left/Right sends Home/End escape sequences (macOS)
- Shift+Enter sends Alt+Enter for multi-line input in CLI agents

* fix(terminal): add preventDefault to Cmd+Arrow, restrict to macOS only

- Add e.preventDefault() to Cmd+Left/Right to prevent Electron
  browser-level back-navigation
- Restrict Cmd+Arrow → Home/End to macOS only since Ctrl+Arrow
  is word-jump on Linux
- Add comment explaining Shift+Enter keyup suppression

* fix(terminal): tighten modifier guards for keyboard shortcuts

- Shift+Enter: exclude Cmd/Ctrl/Alt so compound combos pass through
- Cmd+Arrow: exclude Shift to not intercept Cmd+Shift+Arrow selection

---------

Co-authored-by: maskar <Maskar@users.noreply.github.com>
Co-authored-by: Johannes Millan <johannes.millan@gmail.com>

Author: maskar

src/components/TerminalView.tsx

@@ -171,7 +171,11 @@ export function TerminalView(props: TerminalViewProps) {
     });
 
     term.attachCustomKeyEventHandler((e: KeyboardEvent) => {
-      if (e.type !== 'keydown') return true;
+      if (e.type !== 'keydown') {
+        // Suppress Shift+Enter keyup so xterm doesn't echo a bare Enter
+        if (e.key === 'Enter' && e.shiftKey) return false;
+        return true;
+      }
 
       // Let global app shortcuts pass through to the window handler
       if (matchesGlobalShortcut(e)) return false;
@@ -197,6 +201,27 @@ export function TerminalView(props: TerminalViewProps) {
         return false;
       }
 
+      // Shift+Enter → send as Alt+Enter (newline in CLI agents like Claude Code)
+      if (e.key === 'Enter' && e.shiftKey && !e.metaKey && !e.ctrlKey && !e.altKey) {
+        e.preventDefault();
+        enqueueInput('\x1b\r');
+        return false;
+      }
+
+      // Cmd+Left/Right → Home/End (macOS only; on Linux Ctrl+Arrow is word-jump)
+      if (isMac && e.metaKey && !e.altKey && !e.ctrlKey && !e.shiftKey) {
+        if (e.key === 'ArrowLeft') {
+          e.preventDefault();
+          enqueueInput('\x1b[H'); // Home
+          return false;
+        }
+        if (e.key === 'ArrowRight') {
+          e.preventDefault();
+          enqueueInput('\x1b[F'); // End
+          return false;
+        }
+      }
+
       return true;
     });