fix: Prevent TUI rendering errors by stripping control chars

[xXJSONDeruloXx]

Summary

• strip non-printing terminal control chars like carriage return and backspace in stripAnsi()
• sanitize the collapsed log dock preview before rendering it
• add regression tests for ANSI/control-char stripping

Why

Some process output includes spinner/progress style control bytes such as bare or �. Those bytes can make pi's TUI render orphaned, repeated, or cascading lines when log content is rendered back into widgets/components.

This keeps the current output capture behavior intact, but hardens the render/sanitization path so control characters do not leak into the TUI.

Verification

• npx pnpm test
• npx pnpm typecheck
• npx pnpm lint

Testing with a proc which helps repro this issue (one of various cases, but this is an extreme one for demo purposes):

i=0; while true; do i=$((i+1)); printf '\033[1A\033[2K\033[G[UP-REPRO %04d] this line tries to move the cursor up before rendering preview %s %s %s %s %s\n' "$i" alpha bravo charlie delta echo >&2; sleep 0.2; done

Before:

After:

[aliou]

Hey @xXJSONDeruloXx , thanks for this! Made some tweaks, merging this now and releasing it later today with other fixes