fix(app): make composer input IME-safe and paste-aware (#3343)

* fix(app): preserve native composer input semantics

Native text was round-tripped through application state on every keystroke, which could overwrite an input method's in-flight edits. Keep native text ownership inside the input and reserve application-driven replacement for explicit draft mutations.\n\nRoute native clipboard images through the existing persisted attachment pipeline so keyboard and system paste actions behave like other image sources.

* fix(nix): refresh dependency hash

The native composer dependency changes the fixed npm dependency closure used by desktop builds.

* fix(app): keep composer locked across image pastes

Count concurrent native image persistence operations so submit remains disabled until every pasted image is attached.

* fix(app): replace composer text through the DOM on web

Web TextInput refs are DOM elements, so application-driven draft replacement must update their value and selection without native setNativeProps.

* fix(app): preserve web IME composition

Carry the Chinese IME fix from #2990 into the web composer input boundary.

Co-authored-by: Jimmy Lee <jimersylee+github@gmail.com>

---------

Co-authored-by: Jimmy Lee <jimersylee+github@gmail.com>

packages/app/src/panels/agent-panel.tsx

@@ -1228,7 +1228,9 @@ const ChatAgentReadyContent = memo(function ChatAgentReadyContent({
   // when only toast state changes (which does not affect any draft field).
   const {
     text,
-    setText,
+    editText,
+    replaceText,
+    textReplacementKey,
     attachments,
     setAttachments,
     clear,
@@ -1239,7 +1241,9 @@ const ChatAgentReadyContent = memo(function ChatAgentReadyContent({
   const agentInputDraft = useMemo(
     (): AgentInputDraft => ({
       text,
-      setText,
+      editText,
+      replaceText,
+      textReplacementKey,
       attachments,
       setAttachments,
       clear,
@@ -1249,7 +1253,9 @@ const ChatAgentReadyContent = memo(function ChatAgentReadyContent({
     }),
     [
       text,
-      setText,
+      editText,
+      replaceText,
+      textReplacementKey,
       attachments,
       setAttachments,
       clear,
@@ -1296,7 +1302,10 @@ const ChatAgentReadyContent = memo(function ChatAgentReadyContent({
   const contentContainer = <View style={styles.contentContainer}>{streamContent}</View>;
 
   return (
-    <RewindComposerRestoreProvider text={agentInputDraft.text} setText={agentInputDraft.setText}>
+    <RewindComposerRestoreProvider
+      text={agentInputDraft.text}
+      setText={agentInputDraft.replaceText}
+    >
       <View style={styles.root}>
         <FileDropZone style={styles.container} disabled={isArchivingCurrentAgent}>
           {contentContainer}
@@ -1629,7 +1638,8 @@ function ActiveAgentComposer({
         externalKeyboardShift
         isPaneFocused={isPaneFocused}
         value={agentInputDraft.text}
-        onChangeText={agentInputDraft.setText}
+        onChangeText={agentInputDraft.editText}
+        textReplacementKey={agentInputDraft.textReplacementKey}
         attachments={agentInputDraft.attachments}
         attachmentScopeKeys={attachmentScopeKeys}
         onOpenWorkspaceAttachment={handleOpenWorkspaceAttachment}