Fix f-string backslash syntax error in build_suggestion_chips_html

app.py

@@ -154,11 +154,12 @@ def load_example_data(idx_str):
 
 
 def build_suggestion_chips_html():
-    return "".join(
-        f'<button class="suggestion-chip" onclick="window.__setPrompt({json.dumps(s[\'prompt\'])})">'
-        f'{html_lib.escape(s["label"])}</button>'
-        for s in SUGGESTIONS_CONFIG
-    )
+    chips = []
+    for s in SUGGESTIONS_CONFIG:
+        prompt_json = json.dumps(s["prompt"])
+        label = html_lib.escape(s["label"])
+        chips.append(f'<button class="suggestion-chip" onclick="window.__setPrompt({prompt_json})">{label}</button>')
+    return "".join(chips)
 
 
 print("Building example thumbnails...")