feat: v0.12.0 Settings window, per-session Remote Control, delete conversations

- Settings (⋯ → Settings…, palette): theme, terminal text size, interface
  size, notifications, Remote Control & privacy. The ⋯ menu shrinks.
- Remote Control per session: registry choice > Settings default >
  DEVDESK_REMOTE_CONTROL. Switching an idle session restarts its Claude
  on the same conversation; busy sessions change at the next start.
  rc_active comes from the running process; RC tag on sessions.
- --delete-convo: remove a conversation's local transcript and subagent
  files; refused while in use. Delete… in Search past conversations.
Closes #61

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WHRLCCdXYm41Qx5kNhehaP

libexec/devdesk-claude-run

@@ -27,7 +27,8 @@ RESET=$'\033[0m'
 
 common_args() {
     printf '%s\0' --settings "$SETTINGS"
-    if [ "${DEVDESK_REMOTE_CONTROL:-0}" = "1" ]; then
+    # Per session since devdesk#61 (Settings → Remote Control).
+    if [ "$(dd_rc_wanted "$NAME")" = 1 ]; then
         printf '%s\0' --remote-control "devdesk-$NAME"
     fi
     if [ ${#EXTRA[@]} -gt 0 ]; then
@@ -97,6 +98,15 @@ while :; do
     if [ "$mode" = new ]; then run_new; else run_resume; fi
     rc=$?
     NAME=$(dd_current_session)
+    # Settings changed Remote Control: Claude was stopped to restart on the same
+    # conversation with the new setting (devdesk#61), no menu.
+    restart="$DEVDESK_STATE_DIR/restart/$NAME"
+    if [ -e "$restart" ]; then
+        rm -f "$restart"
+        printf '\n%s◈ Restarting Claude with Remote Control %s…%s\n' "$MUTED" "$([ "$(dd_rc_wanted "$NAME")" = 1 ] && echo on || echo off)" "$RESET"
+        mode=resume
+        continue
+    fi
     while :; do
         menu "$rc"
         IFS= read -rsn1 key || exit 0