fix(purge): remove 60-char hard cap on path display width (issue #564)

The path column in 'mo purge' selection was capped at 60 characters
regardless of terminal width. On wide terminals (120+ cols) this caused
long project paths like ~/GitHub/Ulama/transformer-project to be
truncated unnecessarily to ~17 visible characters.

Remove the hard 60-char cap and let the available terminal space be the
only upper bound, which is already computed as:
  available_for_path = terminal_width - fixed_overhead

Paths now use as much space as the terminal allows while still keeping
the size and artifact-type columns readable.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: tw93

lib/clean/project.sh

@@ -1175,7 +1175,6 @@ clean_project_artifacts() {
             fi
 
             [[ $available_width -lt $min_width ]] && available_width=$min_width
-            [[ $available_width -gt 60 ]] && available_width=60
         fi
 
         # Truncate project path if needed
@@ -1273,7 +1272,6 @@ clean_project_artifacts() {
 
     [[ $max_path_display_width -lt $min_path_width ]] && max_path_display_width=$min_path_width
     [[ $available_for_path -lt $max_path_display_width ]] && max_path_display_width=$available_for_path
-    [[ $max_path_display_width -gt 60 ]] && max_path_display_width=60
     # Ensure path width is at least 5 on very narrow terminals
     [[ $max_path_display_width -lt 5 ]] && max_path_display_width=5