perf: resolve all 7 open performance issues

[Jhong098]

$(cat <<'EOF'

Summary

Resolves all 7 open GitHub performance issues. Two were already fixed in the current codebase (#12, #13) and closed without code changes; the remaining five are addressed here.

• perf: consolidate recordCompletion DB round-trips into a single RPC #14 completions.ts — Replace racy SELECT + UPDATE XP pattern with the pre-existing atomic increment_xp RPC. Eliminates the race condition where two concurrent completions could overwrite each other's XP, and cuts 2 sequential DB round-trips to 1.
• perf: extract draft-saving logic from ChallengeLayout into a render-less component #15 + perf: debounce local draft save to avoid re-triggering on every pixel of a drag #10 ChallengeLayout — Extract draft-saving into a new render-less DraftSaver component that subscribes to the architecture store via Zustand's subscribe() API (outside React's render cycle). ChallengeLayout no longer subscribes to nodes/edges, so it no longer re-renders on every drag pixel.
• perf: cache Supabase admin client per request with React cache() #17 lib/supabase/server.ts — Wrap createAdminClient with React cache() so all server actions within the same request share one client instance.
• perf: replace transition-all with specific transitions on BaseNode #11 BaseNode.tsx — Replace transition-all with transition-[border-color,opacity] to avoid triggering style recalc for unrelated CSS properties on every state change.

Test plan

• Added DraftSaver.test.tsx — covers subscribe-on-mount, 1500ms trailing debounce, rapid-change debounce reset, and unmount cleanup
• Updated completions.test.ts — replaced mockUpdateEq/mockProfileSingle with mockRpc; added assertions that increment_xp is called with correct args and is NOT called on a repeat pass
• Fixed pre-existing e2e failure in config-panel.spec.ts — scoped config-instanceCount locators to the desktop sidebar wrapper to avoid strict-mode ambiguity with MobileConfigPanel
• 165/165 unit tests passing
• 40/40 e2e tests passing (10 skipped — require live Clerk credentials)

https://claude.ai/code/session_017P7S4SuivspHeeXfok7WzX
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Project	Deployment	Actions	Updated (UTC)
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.50%. Comparing base (3d0b03e) to head (46c91de).
⚠️ Report is 1 commits behind head on main.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage   72.50%   72.50%           
=======================================
  Files          11       11           
  Lines         440      440           
  Branches      134      134           
=======================================
  Hits          319      319           
  Misses         72       72           
  Partials       49       49           

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