feat(terminal): natural drag-select + scheme-less clickable links over claude's TUI (v0.190.0)

[vikasprogrammer]

What & why

The browser terminal's selection and links were unnatural: text could only be selected with Option+drag, and links didn't click at all — especially rendered links without a full https://.

Root cause: claude's fullscreen TUI turns on mouse tracking. The moment xterm sees a tracking mode it disables its own selection service and forwards click/drag to the app — hence Option-drag was the only escape, and link clicks got eaten. But claude only ever uses the wheel (it runs with DISABLE_MOUSE_CLICKS); it discards clicks/drags. The old test bed ran plain bash, which never enables mouse tracking, so it never reproduced this.

The rework (web-only — no server/MCP restart)

• stripMouseTracking filters the app's mouse-tracking DECSET modes (1000–1003) out of the PTY output stream before xterm sees them — so xterm stays in its normal, no-mouse state (plain drag selects, links are clickable like a web page). Everything else (SGR encoding, focus, alt-screen, bracketed paste, …) passes through untouched; split-across-frame sequences are carried. Only the wheel is re-supplied to claude as SGR events (via attachCustomWheelEventHandler) so its conversation still scrolls. Documented xterm API only — no internals, survives xterm upgrades.
• makeLinkProvider replaces the stock WebLinksAddon (full https://… only) with custom providers matching bare domains (example.com), subdomains, www.…, localhost:PORT/127.0.0.1:PORT, and OSC-8 hyperlinks — opening the right target in a new tab, while deliberately not underlining file.tsx:42-style tokens.

Reproducing + validation

• New scripts/mouse-tui.mjs reproduces claude's mouse-reporting condition; TERMBED_CMD='node …/mouse-tui.mjs' node scripts/termbed.mjs points the test bed at it.
• Verified end-to-end with Playwright driving the harness under real mouse mode — 7/7:
  • ✓ native drag-select (no Option) selected example.com
  • ✓ bare domain → https://example.com; ✓ localhost:5199 → http://…; ✓ www.google.com → https://…; ✓ full URL passes through
  • ✓ Component.tsx:42 is not a link
  • ✓ wheel forwarded to the app (counter ticked)
• npm run typecheck, cd web && npm run build, and npm run test:governance (68/68) all green.

🤖 Generated with Claude Code