1. _TILE_U: switch tile bg/fg to truecolor (48;2;55;55;55 / 38;2;230;230;230)
so the file-tree tiles render legibly on Win Terminal dark themes
instead of a muddy 8-color block.
2. _ticker: tighten the redraw cadence 0.4s -> 0.1s so the spinner and
status line feel responsive on Windows.
3. terminal title: add _set_term_title() helper and emit OSC 0 on init /
session new / rename / quit so the tab title tracks the active session.
4. _drain: stream-aware grace window — when the pending stream carries a
pending ask_user ("Waiting for your answer"), extend the post-done poll
so the question card is not swallowed before the prompt appears.
5. /emoji command: split _PETS into _PETS_UNICODE / _PETS_ASCII behind a
module-level _pet_style toggle; add the /emoji dispatch + _cmd_emoji
handler so users on fonts without emoji can fall back to ASCII pets.
Local-only edits, no cross-module API change; AST parses clean.
Co-authored-by: Shen Hao <shenhao-stu@users.noreply.github.com>
