wt: display relative paths for all worktrees under repo root

Previously only worktrees under .worktrees/ had their paths
shortened. Worktrees under other subdirectories (e.g.
.claude/worktrees/) showed full absolute paths. Now any worktree
under the repo root displays as a relative path.

Amp-Thread-ID: https://ampcode.com/threads/T-019c86ac-9974-742e-8ceb-83b179d4cde6
Co-authored-by: Amp <amp@ampcode.com>

Author: thiagowfx

wt/wt.sh

@@ -306,8 +306,8 @@ cmd_list() {
 
         if [[ "$path" == "$main_worktree" ]]; then
             path="."
-        elif [[ "$path" == "$main_worktree/.worktrees/"* ]]; then
-            path="$(basename "$path")"
+        elif [[ "$path" == "$main_worktree/"* ]]; then
+            path="${path#"$main_worktree"/}"
         fi
 
         paths+=("$path")
@@ -1336,10 +1336,10 @@ show_dashboard() {
         [[ ${#branch} -gt $max_branch_len ]] && max_branch_len=${#branch}
 
         local display_path="$path"
-        if [[ "$path" == "$main_worktree/.worktrees/"* ]]; then
-            display_path="$(basename "$path")"
-        elif [[ "$path" == "$main_worktree" ]]; then
+        if [[ "$path" == "$main_worktree" ]]; then
             display_path="."
+        elif [[ "$path" == "$main_worktree/"* ]]; then
+            display_path="${path#"$main_worktree"/}"
         fi
         [[ ${#display_path} -gt $max_path_len ]] && max_path_len=${#display_path}
     done
@@ -1351,10 +1351,10 @@ show_dashboard() {
         IFS='|' read -r path branch <<< "$entry"
 
         local display_path="$path"
-        if [[ "$path" == "$main_worktree/.worktrees/"* ]]; then
-            display_path="$(basename "$path")"
-        elif [[ "$path" == "$main_worktree" ]]; then
+        if [[ "$path" == "$main_worktree" ]]; then
             display_path="."
+        elif [[ "$path" == "$main_worktree/"* ]]; then
+            display_path="${path#"$main_worktree"/}"
         fi
 
         local status