Rich dashboard viewer with tabs, token tracking, system prompt splitter, classic/enhanced mode toggle

[rachadaccoumeh]

Hello. thanks for this very helpful project.
I did use this project and it is very helpful. It just misses something. Make it more visually and directly filter things to make it easier. So here we are:

Replaces the minimal

Details

tree renderer with a full-featured dashboard viewer while keeping the legacy tree as a toggleable option.
Changes

• viewer.js: Complete rewrite (~49KB, 905 lines) with:
• Enhanced/Classic mode toggle (persisted in localStorage, default Enhanced)
• Summary stats bar (input/output/cache tokens, tool calls, turns, errors)
• Conversation tab: collapsible turns with per-turn token chips (in/out/cache/tools), tool-use callouts, error highlights
• System tab: auto-splits system prompt on markdown headers and <available_skills> blocks; renders skills as structured list with name, description, location
• Tools tab: all tool declarations with JSON schema preview
• Usage tab: stat cards + per-turn bar charts (input/cache_read/output) + system-section breakdown by char count
• Raw tab: collapsible JSON tree per raw event
• Dark/light theme toggle (persisted)
• Classic mode defines window.buildNode for backward compat
• index.ts: unchanged — reads viewer.js at trace-creation time via readFileSync
• AGENTS.md, README.md: updated with viewer docs and dev workflow
• Fixes: buildModel now skips [meta] requests for tools/system extraction; body background covers full viewport
  How it works
• Zero external dependencies, no build step, works via file:// directly
• JSONL parsed from trailing <!-- comment node
• CSS injected via JS (<style id="otv-styles">) so it works both embedded and as external <script src="viewer.js">
• Place viewer.js next to any .html trace to override the embedded viewer (no regeneration needed)
  Testing
• Verified on 3 trace files (70KB, 793KB, 28MB with 150+ turns and 122 tool calls)
• All tabs render correctly in both modes
• npm run typecheck and npm run lint pass cleanly
• No console errors