feat: add /feedback page, FeedbackModal to TopNav, and footer link

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/(app)/feedback/page.tsx

@@ -0,0 +1,27 @@
+import type { Metadata } from 'next'
+import { FeedbackForm } from '@/components/FeedbackForm'
+
+export const metadata: Metadata = {
+  title: 'Send Feedback — Battl Builders',
+  description:
+    'Report a bug, suggest a feature, or share a thought with the Battl Builders team.',
+}
+
+export default function FeedbackPage() {
+  return (
+    <main className="mx-auto max-w-4xl px-4 py-10">
+      <header className="mb-10">
+        <p className="text-xs font-semibold uppercase tracking-[0.2em] text-zinc-500">
+          Battl Builders
+        </p>
+        <h1 className="mt-2 text-3xl font-semibold tracking-tight">
+          Send Feedback
+        </h1>
+        <p className="mt-2 text-sm text-zinc-400">
+          Bug, feature idea, or general thought — we read everything.
+        </p>
+      </header>
+      <FeedbackForm />
+    </main>
+  )
+}