fix: restore web terminal multiline paste by reverting scrollback to 10000

- Revert xterm.js scrollback from 0 to 10000; empirical correlation with
  bracketed-paste mode failing (each line submitted as separate command).
- Add temporary browser-console diagnostics to confirm whether xterm receives
  pi's \e[?2004h enable sequence and whether outbound paste is BPM-wrapped.
- Keep CSS scrollbar hiding and wheel-sensitivity 0 so the original scroll-jank
  fix remains effective.

Typecheck: passed (apps/web)

apps/web/src/components/features/.pi-map.md

@@ -4,10 +4,10 @@ dir: apps/web/src/components/features
 index: apps/web/src/components/features/.pi-map.index.md
 
 ## role
-Reusable UI components organized by domain-specific feature areas for the web application frontend.
+Feature-specific UI components organized by business domain/capability for the web
 ## files
 ## arch
-Feature-based component colocation pattern with domain-driven folder structure, separating shared/common components from page-specific feature implementations.
+Contains 0 files.
 ## tags
 -
 ## symbols