fix(tui): Enable mouse capture for all terminals to restore scroll functionality (#11487)
## Summary
Fixes the scrolling issue reported in #11434 where users couldn't scroll
through task logs with their mouse on Windows (especially in VSCode's
terminal).
### Problem
PR #11418 introduced VSCode terminal detection that skipped
`EnableMouseCapture` to prevent mouse event leakage to stdout. However,
without mouse capture enabled, crossterm doesn't receive mouse scroll
events—the terminal emulator consumes them for its own scrollback buffer
instead.
### Solution
- Remove VSCode terminal detection entirely
- Always enable mouse capture on startup for all terminals
- Rely on the proper cleanup code (already in place from #11444) to
disable mouse capture on exit
This restores mouse scroll functionality while the existing cleanup code
handles:
- Windows-specific `DisableMouseCapture` requirements
- Panic handler terminal state restoration