fix(app): preserve IME composition across text fields (#3517)

* fix(app): preserve IME composition in form inputs

Form model publication was replaying changing default text into the native or DOM editing surface. Keep the editing surface authoritative, defer web publication until composition commits, and reserve resetKey changes for explicit text replacement.

* refactor(app): centralize text editing authority

Route every app text field, including the composer and plugin runtime, through one platform-owned editing primitive. Its type and runtime reject controlled value replay, its command handle owns programmatic replacement, and lint prevents raw React Native TextInput imports outside the boundary.

* fix(app): restore composer placeholder styling

packages/app/src/command-center/command-center.tsx

@@ -3,7 +3,6 @@ import {
   Modal,
   Pressable,
   Text,
-  TextInput,
   View,
   type LayoutChangeEvent,
   type ListRenderItemInfo,
@@ -18,12 +17,15 @@ import { StyleSheet, withUnistyles } from "react-native-unistyles";
 import {
   BottomSheetBackdrop,
   BottomSheetFlatList,
-  BottomSheetTextInput,
   type BottomSheetFlatListMethods,
 } from "@gorhom/bottom-sheet";
 import { AgentStatusDot } from "@/components/agent-status-dot";
 import { MaterialFileIcon } from "@/components/material-file-icon";
 import { LoadingSpinner } from "@/components/ui/loading-spinner";
+import {
+  EditingTextInput as TextInput,
+  type EditingTextInputHandle,
+} from "@/components/ui/text-input";
 import { Shortcut } from "@/components/ui/shortcut";
 import {
   IsolatedBottomSheetModal,
@@ -69,7 +71,7 @@ import {
 } from "./results";
 import { useWorkspaceFileSearch } from "./workspace-file-search";
 
-const ThemedBottomSheetTextInput = withUnistyles(BottomSheetTextInput, (theme) => ({
+const ThemedBottomSheetTextInput = withUnistyles(TextInput, (theme) => ({
   placeholderTextColor: theme.colors.foregroundMuted,
 }));
 const ThemedTextInput = withUnistyles(TextInput, (theme) => ({
@@ -211,7 +213,7 @@ interface CommandCenterState {
   results: readonly CommandCenterResult[];
   rowIndexByResultId: ReadonlyMap<string, number>;
   offsets: readonly number[];
-  inputRef: React.RefObject<TextInput | null>;
+  inputRef: React.RefObject<EditingTextInputHandle | null>;
   fileSearchLoading: boolean;
   fileSearchError: string | null;
   close(): void;
@@ -227,7 +229,7 @@ function useCommandCenterState(): CommandCenterState {
   const setOpen = useKeyboardShortcutsStore((state) => state.setCommandCenterOpen);
   const setScope = useKeyboardShortcutsStore((state) => state.setCommandCenterScope);
   const snapshot = useCommandCenterContributions();
-  const inputRef = useRef<TextInput>(null);
+  const inputRef = useRef<EditingTextInputHandle>(null);
   const previousOpenRef = useRef(open);
   const [query, setQuery] = useState("");
   const [activeId, setActiveId] = useState<string | null>(null);
@@ -547,7 +549,7 @@ export function CommandCenter() {
   const modalLayer = useGlobalWebOverlayLayer("modal", isWeb && state.open && !showBottomSheet);
   const listRef = useRef<FlatList<CommandCenterListRow>>(null);
   const bottomSheetListRef = useRef<BottomSheetFlatListMethods>(null);
-  const bottomSheetInputRef = useRef<React.ElementRef<typeof BottomSheetTextInput>>(null);
+  const bottomSheetInputRef = useRef<EditingTextInputHandle>(null);
   const scrollMetricsRef = useRef({ offset: 0, visibleLength: 0 });
   const { sheetRef, handleSheetChange, handleSheetDismiss } = useIsolatedBottomSheetVisibility({
     visible: state.open,
@@ -711,7 +713,8 @@ export function CommandCenter() {
           <ThemedBottomSheetTextInput
             testID="command-center-input"
             ref={bottomSheetInputRef}
-            value={state.query}
+            initialValue={state.query}
+            variant="bottom-sheet"
             onChangeText={state.setQuery}
             onKeyPress={keyPress}
             onSubmitEditing={submit}
@@ -749,7 +752,7 @@ export function CommandCenter() {
               <ThemedTextInput
                 testID="command-center-input"
                 ref={state.inputRef}
-                value={state.query}
+                initialValue={state.query}
                 onChangeText={state.setQuery}
                 placeholder={
                   state.scope === "files"