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

lib/services/search-api.ts

@@ -0,0 +1,66 @@
+/**
+ * Web search API wrapper using SearXNG public instances.
+ * No API key required — free for server-side use.
+ */
+
+export interface SearchResult {
+    title: string;
+    url: string;
+    snippet: string;
+}
+
+const SEARXNG_INSTANCES = [
+    "https://searx.be",
+    "https://search.sapti.me",
+    "https://searx.tiekoetter.com",
+    "https://search.bus-hit.me",
+];
+
+async function searchSearXNG(query: string): Promise<SearchResult[]> {
+    for (const instance of SEARXNG_INSTANCES) {
+        try {
+            const url = `${instance}/search?q=${encodeURIComponent(query)}&format=json&categories=general&language=en`;
+            const controller = new AbortController();
+            const timeout = setTimeout(() => controller.abort(), 8000);
+
+            const res = await fetch(url, {
+                signal: controller.signal,
+                headers: {
+                    "User-Agent": "PromptArch/1.4 (https://rommark.dev)",
+                    Accept: "application/json",
+                },
+            });
+            clearTimeout(timeout);
+
+            if (!res.ok) continue;
+
+            const data = await res.json();
+            const results: SearchResult[] = (data.results || [])
+                .slice(0, 8)
+                .map((r: Record<string, string>) => ({
+                    title: r.title || "",
+                    url: r.url || "",
+                    snippet: r.content || "",
+                }))
+                .filter((r: SearchResult) => r.title && r.url);
+
+            if (results.length > 0) return results;
+        } catch {
+            // Try next instance
+        }
+    }
+    return [];
+}
+
+export async function searchWeb(query: string): Promise<SearchResult[]> {
+    // Clean the query — take first meaningful line, max 200 chars
+    const cleanQuery = query
+        .split("\n")[0]
+        .replace(/\[.*?\]/g, "")
+        .trim()
+        .substring(0, 200);
+
+    if (!cleanQuery || cleanQuery.length < 3) return [];
+
+    return searchSearXNG(cleanQuery);
+}