chore: drop dead estimateTokens and the unused ChatBar clear handle

estimateTokens had no callers. The imperative clear() had none either —
it was the only caller left relying on clearAll's cleanupSources default,
which is why abandoned sources looked like they were being swept when
nothing invoked the path. setInput stays; it is used for prompt
suggestions.

Author: kfaracik

components/chat-screen/ChatBar.tsx

@@ -54,7 +54,6 @@ interface Props {
   onSelectModel: () => void;
   onSelectPrompt: (prompt: string) => void;
   ref: Ref<{
-    clear: () => void;
     setInput: (text: string) => void;
   }>;
   model: Model | undefined;
@@ -120,23 +119,14 @@ const ChatBar = ({
   useImperativeHandle(
     ref,
     () => ({
-      clear: () => {
-        setUserInput('');
-        clearAll({ cleanupSources: true });
-        extraContentPadding.set(0);
-        if (Platform.OS === 'ios') {
-          textInputRef.current?.setNativeProps({ text: ' ' });
-          textInputRef.current?.setNativeProps({ text: '' });
-        }
-      },
       setInput: (text: string) => {
         setUserInput(text);
         if (Platform.OS === 'ios') {
           setIosInputKey((k) => k + 1);
         }
       },
     }),
-    [clearAll, extraContentPadding]
+    []
   );
 
   const handleBarLayoutForPadding = useCallback(

components/chat-screen/ChatScreen.tsx

@@ -64,7 +64,6 @@ export default function ChatScreen({
   openModelSheetRef,
 }: Props) {
   const inputRef = useRef<{
-    clear: () => void;
     setInput: (text: string) => void;
   }>(null);
   const messagesRef = useRef<MessagesHandle>(null);

constants/context-window.ts

@@ -22,9 +22,6 @@ export const getContextWindowTokens = (model: Model): number =>
   (model.family ? CONTEXT_WINDOW_TOKENS_BY_FAMILY[model.family] : undefined) ??
   DEFAULT_CONTEXT_WINDOW_TOKENS;
 
-export const estimateTokens = (text: string): number =>
-  Math.ceil(text.length / CHARS_PER_TOKEN);
-
 export const getPromptCharBudget = (model: Model): number => {
   const promptTokenBudget = Math.max(
     0,