turborepo

379ce9a6 - fix: Emit space for empty vt100 cells to fix TUI repaint on task switch (#11789)

fix: Emit space for empty vt100 cells to fix TUI repaint on task switch (#11789) ## Summary Fixes #11779 The ratatui 0.30 upgrade (PR #11723) introduced a TUI rendering glitch where characters from a previous task's output "bleed through" when switching to a task with shorter output. The `tui-term` upgrade from 0.1.9 to 0.3.1 changed `state::handle` to apply **all** vt100 screen cells to the ratatui buffer — including empty ones. Previously, empty cells were skipped. Our `fill_buf_cell` bridge function was calling `set_symbol("")` for these empty cells, producing a zero-width symbol that ratatui's diff algorithm correctly detects as "changed" but writes nothing to the terminal, leaving the previous frame's characters visible. The fix writes `" "` (space) instead of `""` for empty cells, which properly overwrites stale content from the previous frame. ### To test 1. Use the reproduction at https://github.com/jeremybanka/turbo-tui-buffer-fails-to-clear-repro (or any monorepo with tasks producing different output lengths) 2. `turbo dev` (or `turbo run` with `--ui=tui`) 3. Arrow up/down between tasks — the pane should fully repaint with no leftover characters