fix(siren/dump): add function to strip ANSI escape sequences from output

The `cursor` CLI tool started printing some info about outdated version before clearing the screen with ANSI escape sequences. Hence we need to filter that out when dumping the list of extensions to a lock file.

siren

@@ -283,6 +283,12 @@ resolve_symlink() {
   fi
 }
 
+# Strip ANSI escape sequences from stdin and write clean text to stdout.
+# This removes CSI sequences like ESC[...A/K that UIs use for status lines.
+strip_ansi_sequences() {
+  awk '{ gsub(/\033\[[0-9;?]*[ -\/]*[@-~]/, ""); print }'
+}
+
 # Backup and symlink.
 backup_and_link() {
   local source="$1"
@@ -1101,7 +1107,9 @@ do_dump_extensions() {
     echo "# ${SETUP_EDITOR} Extensions"
     echo "# Generated on ${current_date}"
     echo
-    "${editor_cmd}" --list-extensions --show-versions 2> /dev/null
+    "${editor_cmd}" --list-extensions --show-versions 2> /dev/null |
+      strip_ansi_sequences |
+      grep -E '^[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+@[A-Za-z0-9._-]+$'
   } > "${extensions_lock}"
 
   info "Extensions list dumped to ${extensions_lock}"