docs(docs): add LeetCode problem markdown pages and docs site assets

apps/docs/content/progress.mdx

@@ -0,0 +1,9 @@
+---
+title: Progress
+description: Live SRS campaign dashboard — phases, ladder, review queue, gates, and recent attempts, fetched from the SRS Worker.
+---
+
+Live view of the 56-day campaign. Everything below is fetched client-side
+from the SRS Worker, so it is always current — no rebuild required.
+
+<ProgressDashboard />