fix: AI Copilot shows all presets in suggestion list

Change suggestions from getContextualSuggestions (filtered)
to promptMgr.presets (all). MIDI item name still shown in
header when hasSelItem is true.

app/static/js/app.jsx

@@ -16128,7 +16128,7 @@ const App = () => {
         const selMidiInfo = getSelectedMidiItemInfo();
         const hasSelItem = !!selMidiInfo;
         const promptMgr = window.PromptTemplateManager ? new window.PromptTemplateManager() : null;
-        const suggestions = promptMgr ? promptMgr.getContextualSuggestions(hasSelItem) : [];
+        const suggestions = promptMgr ? promptMgr.presets : [];
         const handleApplySuggestion = (preset) => {
           if (hasSelItem) {
             setAiPrompt(`Rearrange this melody line in ${preset.name} style`);