fix(vin-decode): repair Business page 500 + drop redundant VIN buttons

- Business page returned 500: getTrialFunnel's `ORDER BY CASE bucket ...`
  referenced the SELECT-list alias inside an expression, which Postgres
  can't resolve (error 42703 "column bucket does not exist"). Wrap the
  GROUP BY in a subquery so `bucket` is a real column the ORDER BY can use.
  Verified against prod: original errors, fixed query returns ordered buckets.
- Remove the "Çözülen / Çözülemeyen VIN'ler" dashboard buttons — the VIN
  list already has a success/error status filter, so they were redundant.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/app/projects/sase/vin-decode/page.tsx

@@ -109,20 +109,6 @@ export default async function VinDecodePage({
           >
             VIN list →
           </Link>
-          <Link
-            href={`/projects/sase/vin-decode/vins?success=true&from=${encodeURIComponent(health.rangeStart.toISOString())}`}
-            className={buttonVariants({ variant: "outline", size: "sm" })}
-            title="Bu pencerede başarıyla çözülen VIN kodları"
-          >
-            ✓ Çözülen VIN&apos;ler
-          </Link>
-          <Link
-            href={`/projects/sase/vin-decode/vins?success=false&from=${encodeURIComponent(health.rangeStart.toISOString())}`}
-            className={buttonVariants({ variant: "outline", size: "sm" })}
-            title="Bu pencerede çözülemeyen VIN kodları"
-          >
-            ✗ Çözülemeyen VIN&apos;ler
-          </Link>
           <Link
             href="/projects/sase/vin-decode/business"
             className={buttonVariants({ variant: "outline", size: "sm" })}

apps/web/src/lib/sase/business-impact.ts

@@ -312,19 +312,24 @@ export async function getTrialFunnel(days = 90): Promise<TrialFunnelRow[]> {
         AND q.created_at <= coalesce(t.trial_end, now())
       GROUP BY t.user_id, t.converted
     )
-    SELECT
+    SELECT bucket, trial_users, converted
-      CASE
+    FROM (
-        WHEN decode_count = 0 THEN '0'
+      SELECT
-        WHEN decode_count BETWEEN 1 AND 2 THEN '1-2'
+        CASE
-        WHEN decode_count BETWEEN 3 AND 5 THEN '3-5'
+          WHEN decode_count = 0 THEN '0'
-        WHEN decode_count BETWEEN 6 AND 10 THEN '6-10'
+          WHEN decode_count BETWEEN 1 AND 2 THEN '1-2'
-        WHEN decode_count BETWEEN 11 AND 25 THEN '11-25'
+          WHEN decode_count BETWEEN 3 AND 5 THEN '3-5'
-        ELSE '26+'
+          WHEN decode_count BETWEEN 6 AND 10 THEN '6-10'
-      END AS bucket,
+          WHEN decode_count BETWEEN 11 AND 25 THEN '11-25'
-      count(*) AS trial_users,
+          ELSE '26+'
-      count(*) FILTER (WHERE converted = true) AS converted
+        END AS bucket,
-    FROM trial_decode_counts
+        count(*) AS trial_users,
-    GROUP BY bucket
+        count(*) FILTER (WHERE converted = true) AS converted
+      FROM trial_decode_counts
+      GROUP BY 1
+    ) b
+    -- ORDER BY references the real subquery column bucket; Postgres won't
+    -- resolve a SELECT-list alias inside an expression in ORDER BY (42703).
     ORDER BY
       CASE bucket
         WHEN '0' THEN 0