fix: fix keybindings (#406)

Co-authored-by: Letta <noreply@letta.com>

vendor/ink-text-input/build/index.js

@@ -31,6 +31,14 @@ function isControlSequence(input, key) {
     // CSI sequences (ESC[...), Option+Delete (ESC + DEL), and other multi-char escape sequences
     if (input && typeof input === 'string' && input.startsWith('\x1b') && input.length > 1) return true;
 
+    // Forward delete (fn+Delete on macOS): handled by parent's raw input handler
+    // Check timestamp to avoid double-processing (globalThis.__lettaForwardDeleteTimestamp)
+    // Only forward delete sets this; regular backspace doesn't, so backspace still works here
+    if (key.delete && globalThis.__lettaForwardDeleteTimestamp && 
+        (Date.now() - globalThis.__lettaForwardDeleteTimestamp) < 100) {
+        return true;
+    }
+
     return false;
 }