Workflow stage drawer looks unlike the rest of FlyBot (tabs, buttons, node cards, header) #1654

Reported by the owner: 「这个UI风格和其他地方差很多」 — the workflow stage drawer (header icon, 流程图/详情/运行记录 tabs, run description card, 恢复默认/编辑 buttons, node cards) uses its own radii, bordered buttons, square-ish tabs and hard-coded accent rgba values, so it reads differently from the chat and the Bot details drawer.

Expected: the drawer reuses the existing FlyBot tokens and patterns from core styles.js — the Bot drawer's title/role typography and .bt-tabs pill tabs, the soft pill buttons (.bt-soft / .bt-q-btn), chat-bubble surfaces (--bt-bubble, 18px radius) for node cards and the run card, system font stack, and accent tints mixed from --bt-accent instead of a fixed rgba(77,107,254,…). No new palette.