Release v0.18.3-preview.0

What's Changed

• chore(release): v0.18.2 by @qwen-code-ci-bot in #5243
• fix(cli): Stop after cancelled ask_user_question by @doudouOUC in #5218
• fix(cli): render slash suggestion descriptions on a single truncated line by @yiliang114 in #5236
• ci(release): report required Test checks on release PRs and auto-approve by @yiliang114 in #5250
• fix(core): always declare exit_plan_mode so plan mode can call it (#5210) by @yiliang114 in #5251

Full Changelog: v0.18.2...v0.18.3-preview.0