fix: preserve Fast Refresh component boundaries

src/shared/ai-elements/prompt-input.tsx

@@ -210,7 +210,7 @@ const ProviderAttachmentsContext = createContext<AttachmentsContext | null>(
   null
 );
 
-export const usePromptInputController = () => {
+const usePromptInputController = () => {
   const ctx = useContext(PromptInputController);
   if (!ctx) {
     throw new Error(
@@ -224,7 +224,7 @@ export const usePromptInputController = () => {
 const useOptionalPromptInputController = () =>
   useContext(PromptInputController);
 
-export const useProviderAttachments = () => {
+const useProviderAttachments = () => {
   const ctx = useContext(ProviderAttachmentsContext);
   if (!ctx) {
     throw new Error(
@@ -371,7 +371,7 @@ export const PromptInputProvider = ({
 
 const LocalAttachmentsContext = createContext<AttachmentsContext | null>(null);
 
-export const usePromptInputAttachments = () => {
+const usePromptInputAttachments = () => {
   // Prefer local context (inside PromptInput) as it has validation, fall back to provider
   const provider = useOptionalProviderAttachments();
   const local = useContext(LocalAttachmentsContext);
@@ -395,10 +395,10 @@ export interface ReferencedSourcesContext {
   clear: () => void;
 }
 
-export const LocalReferencedSourcesContext =
+const LocalReferencedSourcesContext =
   createContext<ReferencedSourcesContext | null>(null);
 
-export const usePromptInputReferencedSources = () => {
+const usePromptInputReferencedSources = () => {
   const ctx = useContext(LocalReferencedSourcesContext);
   if (!ctx) {
     throw new Error(