generalize convert-to-mp3 into convert-audio with selectable target format

- rename task to convert-audio, support mp3/flac/wav/ogg/aac/opus targets
- add options input type with selectable pill buttons in UI
- extend seed script parser to handle YAML list properties (options)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/workspaces/officerdev/src/apps/FileBrowser/FileBrowserApp/components/TaskRunnerModal.tsx

@@ -198,6 +198,7 @@ type TaskInputDef = {
   type: string;
   description?: string;
   default?: string;
+  options?: string[];
 };
 
 type TaskInputFormProps = {
@@ -239,6 +240,26 @@ const TaskInputForm = ({ inputDefs, values, onChange, autoFilledKeys }: TaskInpu
           );
         }
 
+        if (def.options && def.options.length > 0) {
+          const selected = values[key] ?? def.default ?? def.options[0]!;
+          return (
+            <div key={key} className="flex flex-col gap-1.5">
+              <span className="text-sm font-medium text-duck-dark dark:text-foreground">{def.description ?? key}</span>
+              <div className="flex flex-wrap gap-1.5">
+                {def.options.map((opt) => (
+                  <button
+                    key={opt}
+                    onClick={() => onChange(key, opt)}
+                    className={`px-3 py-1 text-xs font-medium rounded-md transition-colors cursor-pointer ${selected === opt ? 'bg-duck-teal text-white' : 'bg-duck-dark/5 dark:bg-foreground/5 text-duck-dark/60 dark:text-foreground/60 hover:text-duck-dark dark:hover:text-foreground hover:bg-duck-dark/10 dark:hover:bg-foreground/10'}`}
+                  >
+                    {opt}
+                  </button>
+                ))}
+              </div>
+            </div>
+          );
+        }
+
         // Default: text input for string/number
         return (
           <div key={key} className="flex flex-col gap-1">