fix: allow Option+Backspace word-delete in input fields

The terminal's Alt+Backspace and Ctrl+Backspace keyboard handlers were
registered on window with capture:true, intercepting the events globally
— even when focus was in an input or textarea. This prevented native
word-delete (Option+Backspace on macOS) from working in dialogs like
the Add Worktree form. Skip the PTY forwarding when the event target
is an INPUT or TEXTAREA.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/renderer/src/components/terminal-pane/keyboard-handlers.ts

@@ -140,6 +140,7 @@ export function useTerminalKeyboardShortcuts({
     }
 
     // Ctrl+Backspace → send \x17 (backward-kill-word) to PTY.
+    // Skip when focus is in an input/textarea so native word-delete still works.
     const onCtrlBackspace = (e: KeyboardEvent): void => {
       if (!e.ctrlKey || e.metaKey || e.altKey || e.shiftKey) {
         return
@@ -147,6 +148,10 @@ export function useTerminalKeyboardShortcuts({
       if (e.key !== 'Backspace') {
         return
       }
+      const tag = (e.target as HTMLElement)?.tagName
+      if (tag === 'INPUT' || tag === 'TEXTAREA') {
+        return
+      }
 
       const manager = managerRef.current
       if (!manager) {
@@ -164,6 +169,7 @@ export function useTerminalKeyboardShortcuts({
     }
 
     // Alt+Backspace → send ESC + DEL (\x1b\x7f, backward-kill-word) to PTY.
+    // Skip when focus is in an input/textarea so native word-delete still works.
     const onAltBackspace = (e: KeyboardEvent): void => {
       if (!e.altKey || e.metaKey || e.ctrlKey || e.shiftKey) {
         return
@@ -171,6 +177,10 @@ export function useTerminalKeyboardShortcuts({
       if (e.key !== 'Backspace') {
         return
       }
+      const tag = (e.target as HTMLElement)?.tagName
+      if (tag === 'INPUT' || tag === 'TEXTAREA') {
+        return
+      }
 
       const manager = managerRef.current
       if (!manager) {