[argszero]

Summary

Wave wrap-up for item G (其他细节) of the UI/UE round-3 wave (rant 2026-08-17T18:06:09, version v1.18).

Item G has two acceptance points, and both were already implemented in the codebase — this PR verifies them with a DOM-stub smoke test and documents the confirmation (docs-only change):

1. 视图切换后滚动位置复位 (scroll reset on view switch) — switchView already sets $("#main").scrollTop = 0 after rendering; .main is the scroll container (flex: 1; overflow-y: auto). Verified: switch → #main.scrollTop resets to 0, repeatedly.
2. 复制成功按钮短暂变「已复制 ✓」 (copy button flash) — copyKey already implements flash(ok): on success the button turns into「已复制 ✓」(disabled), restores after 1.2s; degraded path shows「请 Ctrl+C」(in place since v1.16). Verified: click → 已复制 ✓ + disabled → restore after 1.2s.

What this PR changes

• docs/user-stories.md: v1.18 entry now marks G ✓ with both items verified and declares the whole A–G wave closed (PR feat(ui): dashboard SVG sparklines — daily net + earn trend (v1.18 A) #48–docs(ui): mark item G verified — scroll reset + copy flash, close v1.18 wave #54).
• ui/README.md: new "其他细节约定" section (scroll-reset rule + copy-flash rule).

No production code change — the rant's G items were already satisfied; this documents and closes the wave.

Verification

• DOM-stub smoke test (5 assertions): G1 scroll reset ×2, G2 flash / disabled / restore ✓
• node --check ✓ · cargo test ✓ · cargo fmt --check ✓

Rant (verbatim)

G. 其他细节

• 侧边栏视图切换后滚动位置复位（main 回到顶部）
• 复制成功时按钮短暂变「已复制 ✓」（当前只有 toast + key 闪烁）

Docs

• docs/user-stories.md v1.18 entry completed for G
• ui/README.md: "其他细节约定" section added