feat: Phase 1a — response panel improvements

[aks-builds]

Summary

• JsonTreeView — collapsible JSON tree with colour-coded types, auto-expand to depth 2, click to toggle nodes
• Tree / Table / Raw toggle — body tab now defaults to tree view; table view auto-detected for array responses; raw pre preserved as fallback
• JSONPath filter bar — $.path input above body content, filters response in real time using jsonpath-plus; error indicator for invalid paths
• Ctrl+F body search — keyboard shortcut opens search bar with match counter and amber highlights in raw view; Escape/Ctrl+F to close
• Timeline tab — new tab showing total request duration with Waiting and Receiving segments as animated bars

Technical notes

• jsonpath-plus added as production dependency (renderer bundle via Vite)
• PikoResponse gains timing?: { ttfb: number; total: number } — REST adapter populates it; other adapters fall back to { ttfb: duration, total: duration }
• onDownloadProgress (browser-only) removed; timing is single-phase and honest
• filteredBody computed via useMemo; filter error cleared via useEffect — no setState during render
• Digest auth retry path now includes timing field

Test plan

• Unit tests: 113/113 passing (npx vitest run)
• TypeScript clean on both configs
• Send a REST request → body tab defaults to tree view, collapse/expand nodes
• Send request returning array → Table button appears, shows column grid
• Type $.stats in filter → tree updates to filtered subtree
• Type invalid path → red "Invalid path" indicator appears
• Press Ctrl+F → search bar opens; type a key → matches highlighted in raw view
• Click Timeline tab → duration bar visible with Waiting and total time

🤖 Generated with Claude Code

[aks-reviewes]

Auto-approved by aks-builds secondary account - PR opened by the sole codeowner.

[aks-codeowner-bot]

Auto-approved by aks-codeowner-bot - PR opened by the sole codeowner.