perf: lazy-load heavy client bundles, parallelize API reads, drop dead deps, type the parser

[Emp1500]

Changes

• Lazy-load the three.js DottedSurface background behind next/dynamic. The 516KB three.js chunk no longer blocks initial load on /, /login, /register.
• Defer Monaco and Mermaid (CodeEditor.tsx, ShareView.tsx, FlowchartPanel.tsx) behind next/dynamic / dynamic import() with loading states, so the editor shell paints before those libraries download.
• Parallelize the two independent Supabase reads in GET /api/flowcharts/[id] with Promise.all instead of sequential awaits — one fewer round trip on every editor/share page load.
• Remove dead dependencies (next-themes, tw-animate-css) and move shadcn/@types/three from dependencies to devDependencies.
• Replace any with precise AST types across lib/parser/javascript.ts, typescript.ts, python.ts, dropping the file-wide eslint-disable in favor of narrow interfaces per node shape.
  No user-visible behavior, routes, or API response shapes changed.

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Project	Deployment	Actions	Updated (UTC)
code2flow	Ready	Preview, Comment	Jul 13, 2026 10:30am