fix: prevent mode name from disappearing when editing other fields

- Fix mode name input field to check currentEditingField === "modeName" instead of just currentEditingModeSlug
- Add currentEditingField: "modeName" to onFocus handler to properly track field editing state
- This prevents the mode name from showing empty local state when other fields are being edited

Fixes the issue where mode name would disappear when editing description, role definition, or other fields in custom modes.

Author: roomote

webview-ui/src/components/modes/ModesView.tsx

@@ -780,7 +780,7 @@ const ModesView = ({ onDone }: ModesViewProps) => {
 									<Input
 										type="text"
 										value={
-											editingState.currentEditingModeSlug === visualMode
+											editingState.currentEditingField === 'modeName' && editingState.currentEditingModeSlug === visualMode
 												? editingState.modeName
 												: (getModeProperty(findModeBySlug(visualMode, customModes), "name") ??
 													"")
@@ -791,6 +791,7 @@ const ModesView = ({ onDone }: ModesViewProps) => {
 												setEditingState(prev => ({
 													...prev,
 													currentEditingModeSlug: visualMode,
+													currentEditingField: 'modeName',
 													modeName: customMode.name
 												}))
 											}