fix: restore desktop startup and align tool previews with SDK updates

Add reflect-metadata bootstrap so desktop sidecar no longer crashes on startup.
Update SDK v1.4 compatibility for model variant and diff payload handling.
Unify write/edit/apply patch expanded previews and hide write success output noise.

packages/ui/src/components/chat/message/toolRenderers.tsx

@@ -36,6 +36,47 @@ const formatInputForDisplay = (input: Record<string, unknown>, toolName?: string
     return formatToolInput(input, toolName || '');
 };
 
+const getPatchText = (value: unknown): string | undefined => {
+    if (typeof value === 'string') {
+        const trimmed = value.trim();
+        return trimmed.length > 0 ? trimmed : undefined;
+    }
+
+    if (value && typeof value === 'object') {
+        const patch = (value as { patch?: unknown }).patch;
+        if (typeof patch === 'string') {
+            const trimmed = patch.trim();
+            return trimmed.length > 0 ? trimmed : undefined;
+        }
+    }
+
+    return undefined;
+};
+
+const getToolMetadataPatch = (metadata?: Record<string, unknown>): string | undefined => {
+    if (!metadata || typeof metadata !== 'object') {
+        return undefined;
+    }
+
+    const topLevelPatch = getPatchText((metadata as { patch?: unknown }).patch) ?? getPatchText(metadata.diff);
+    if (topLevelPatch) {
+        return topLevelPatch;
+    }
+
+    const files = Array.isArray((metadata as { files?: unknown }).files) ? (metadata as { files: unknown[] }).files : [];
+    for (const file of files) {
+        if (!file || typeof file !== 'object') {
+            continue;
+        }
+        const patch = getPatchText((file as { patch?: unknown }).patch) ?? getPatchText((file as { diff?: unknown }).diff);
+        if (patch) {
+            return patch;
+        }
+    }
+
+    return undefined;
+};
+
 export const tryParseJsonOutput = (output: string): { data: unknown; isJson: boolean } => {
     if (!output || typeof output !== 'string') {
         return { data: null, isJson: false };
@@ -73,10 +114,11 @@ export const formatEditOutput = (output: string, toolName: string, metadata?: Re
         cleaned = stripLspDiagnostics(cleaned);
     }
 
-    if ((toolName === 'edit' || toolName === 'multiedit' || toolName === 'apply_patch') && cleaned.trim().length === 0 && metadata?.diff) {
-
-        const diff = metadata.diff;
-        return typeof diff === 'string' ? diff : String(diff);
+    if ((toolName === 'edit' || toolName === 'multiedit' || toolName === 'apply_patch') && cleaned.trim().length === 0) {
+        const diff = getToolMetadataPatch(metadata);
+        if (diff) {
+            return diff;
+        }
     }
 
     return cleaned;