feat: extract social links from JS-rendered buttons on clinic website

Added A4 parallel Firecrawl call with actions: [wait 3s, scrape]
to execute JavaScript and extract social button href URLs from
header/footer. This is the most reliable source — most Korean
clinics have Facebook/Instagram/YouTube/Blog icons in their nav.

Results merged as Source 3 (buttonHandles) alongside HTML links,
JSON extraction, and API searches.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

supabase/functions/discover-channels/index.ts

@@ -95,7 +95,8 @@ Deno.serve(async (req) => {
     // STAGE A: Firecrawl scrape + map (parallel)
     // ═══════════════════════════════════════════
 
-    const [scrapeResult, mapResult, brandResult] = await Promise.allSettled([
+    const [scrapeResult, mapResult, brandResult, socialButtonResult] = await Promise.allSettled([
+      // A1. Main scrape — clinic info + links
       fetch("https://api.firecrawl.dev/v1/scrape", {
         method: "POST",
         headers: { "Content-Type": "application/json", Authorization: `Bearer ${FIRECRAWL_API_KEY}` },
@@ -119,12 +120,14 @@ Deno.serve(async (req) => {
         }),
       }).then(r => r.json()),
 
+      // A2. Map site
       fetch("https://api.firecrawl.dev/v1/map", {
         method: "POST",
         headers: { "Content-Type": "application/json", Authorization: `Bearer ${FIRECRAWL_API_KEY}` },
         body: JSON.stringify({ url, limit: 50 }),
       }).then(r => r.json()),
 
+      // A3. Branding extraction
       fetch("https://api.firecrawl.dev/v1/scrape", {
         method: "POST",
         headers: { "Content-Type": "application/json", Authorization: `Bearer ${FIRECRAWL_API_KEY}` },
@@ -137,12 +140,49 @@ Deno.serve(async (req) => {
           waitFor: 3000,
         }),
       }).then(r => r.json()).catch(() => ({ data: { json: {} } })),
+
+      // A4. Social button links — execute JS to extract all <a href> pointing to social platforms
+      fetch("https://api.firecrawl.dev/v1/scrape", {
+        method: "POST",
+        headers: { "Content-Type": "application/json", Authorization: `Bearer ${FIRECRAWL_API_KEY}` },
+        body: JSON.stringify({
+          url,
+          formats: ["json"],
+          jsonOptions: {
+            prompt: "Find ALL social media link URLs on this page. Look in the header, footer, sidebar, and floating buttons. Extract the actual href URLs (not just text) for: Instagram, YouTube, Facebook, TikTok, Naver Blog (blog.naver.com), KakaoTalk (pf.kakao.com), Twitter/X. Include ALL variants found.",
+            schema: {
+              type: "object",
+              properties: {
+                socialLinks: {
+                  type: "array",
+                  items: {
+                    type: "object",
+                    properties: {
+                      platform: { type: "string" },
+                      url: { type: "string" },
+                    },
+                  },
+                },
+              },
+            },
+          },
+          waitFor: 5000,
+          actions: [
+            { type: "wait", milliseconds: 3000 },
+            { type: "scrape" },
+          ],
+        }),
+      }).then(r => r.json()).catch(() => ({ data: { json: {} } })),
     ]);
 
     const scrapeData = scrapeResult.status === "fulfilled" ? scrapeResult.value : { data: {} };
     const mapData = mapResult.status === "fulfilled" ? mapResult.value : {};
     const brandData = brandResult.status === "fulfilled" ? brandResult.value : { data: { json: {} } };
 
+    // A4 result: social buttons from JS-rendered page
+    const socialButtonData = socialButtonResult.status === "fulfilled" ? socialButtonResult.value : { data: { json: {} } };
+    const socialButtons = (socialButtonData.data?.json?.socialLinks || []) as { platform?: string; url?: string }[];
+
     const clinic = scrapeData.data?.json || {};
     let resolvedName = inputClinicName || clinic.clinicName || clinic.clinicNameEn || "";
 
@@ -184,6 +224,12 @@ Deno.serve(async (req) => {
       kakao: scrapeSocial.kakao ? [scrapeSocial.kakao] : [],
     };
 
+    // Source 3: Social button links from JS-rendered page (most reliable!)
+    const socialButtonUrls = socialButtons
+      .map(b => typeof b.url === 'string' ? b.url : '')
+      .filter(u => u.length > 5);
+    const buttonHandles = extractSocialLinks(socialButtonUrls);
+
     // ═══════════════════════════════════════════
     // STAGE B: Direct API searches + Perplexity (ALL PARALLEL)
     // Each API directly searches for the clinic's presence
@@ -410,7 +456,7 @@ Deno.serve(async (req) => {
     // STAGE C: Merge ALL sources + Verify
     // ═══════════════════════════════════════════
 
-    const merged = mergeSocialLinks(linkHandles, firecrawlHandles, apiHandles);
+    const merged = mergeSocialLinks(linkHandles, firecrawlHandles, buttonHandles, apiHandles);
 
     const cleanHandles = {
       instagram: [...new Set(merged.instagram.map(h => extractHandle(h, 'instagram')).filter((h): h is string => h !== null))],