feat: v1.4.0 — review code, web search grounding, responsive preview

New features:
- Review Code button sends generated code back to AI for review
- Web search grounding via SearXNG (toggle in toolbar, enriches prompts)
- Responsive preview with device size selector (Full/Desktop/Tablet/Mobile)
- /api/search proxy route

Fixes:
- Model selector text color now white on dark theme
- Post-coding button text overflow (shorter labels + min-w-0)
- Duplicate activateArtifact button suppressed when action row shows

app/api/search/route.ts

@@ -0,0 +1,27 @@
+/**
+ * Next.js API route: Web search proxy.
+ * Calls SearXNG public instances and returns top results.
+ * Endpoint: GET /api/search?q=your+query
+ */
+
+import { NextRequest, NextResponse } from "next/server";
+import { searchWeb } from "@/lib/services/search-api";
+
+export async function GET(request: NextRequest) {
+    const query = request.nextUrl.searchParams.get("q");
+
+    if (!query || query.trim().length < 3) {
+        return NextResponse.json({ results: [], error: "Query too short" });
+    }
+
+    try {
+        const results = await searchWeb(query);
+        return NextResponse.json({ results });
+    } catch (error) {
+        console.error("Search API error:", error);
+        return NextResponse.json(
+            { results: [], error: "Search failed" },
+            { status: 500 }
+        );
+    }
+}