[codecane] Tweak input placeholder text

Author: jahooma

cli/src/chat.tsx

@@ -865,7 +865,7 @@ export const App = ({
                 value={inputValue}
                 onChange={setInputValue}
                 onSubmit={handleSubmit}
-                placeholder="Share your thoughts and press Enter…"
+                placeholder="Type your coding task or '/' to see available commands"
                 focused={inputFocused}
                 maxHeight={5}
                 width={inputWidth}