feat(ui): login page polish — logo glow, focus ring, inline validation, remember-me (v1.19 G)

[argszero]

Summary

UI/UE 4th-round deepening — item G: login page polish (rant 2026-08-17T20:39:30, v1.19) — final item of the wave.

Login card visual refinement:

• Logo enlarged (52px + gradient glow 0 0 18px rgba(78,205,196,.35))
• Brand hierarchy: h1 bumped to 22px, subtitle line-height tuned
• Input focus glow: 0 0 0 3px var(--accent-soft) ring (both themes)

Inline validation:

• Empty email → 「请输入邮箱 / 账号」; empty password → 「请输入密码」 — reuses the existing setFieldError/field-error component (red border + inline text, focus first error, auto-clear on input); form is novalidate (self-managed)
• Inputs given ids #login-email / #login-pass

Remember-me:

• #login-remember checkbox → localStorage atp-remember (saved on submit, restored on load)
• demo-hint small print showing the demo credentials

Docs: docs/user-stories.md v1.19 — wave closed (A–G, PR #55–#61). Verified by DOM-stub smoke test (25 assertions: empty-submit errors, per-field, auto-clear, successful login, remember-me persist+restore, HTML/CSS structure), cargo test, cargo fmt --check.

Rant (verbatim)

Rant: UI/UE 第四轮多角度深化 — 状态保持、信息密度、原生控件美化、帮助可达性（宿主 2026-08-17 第四轮指示：继续从多角度美化 UI、优化 UE）

G. 登录页 polish

• 登录卡片视觉微调：logo 加大、副文案层次、输入框聚焦光晕；
• 登录失败模拟：空邮箱/密码提交时行内错误（复用 field-error），非仅 toast；
• 「记住我」checkbox + 演示模式说明小字（可选）

Related

• Rant timestamp: 2026-08-17T20:39:30.507364 (project aitokenpool; A = feat(ui): URL hash routing — share/bookmark/refresh restore (v1.19 A) #55, B = feat(ui): transactions summary bar — income/expense/net tied to tab & column filters (v1.19 B) #56, C = feat(ui): custom SVG select arrow — appearance:none, themed, hover/focus like input (v1.19 C) #57, D = feat(ui): toast queue — stack up to 3, independent fade in/out, keep grading styles (v1.19 D) #58, E = feat(ui): shortcuts help panel — ?/Shift+/ toggle, Esc close, view+theme context (v1.19 E) #59, F = feat(ui): marketplace row expand — max tokens, price conversion, multi-key failover detail (v1.19 F) #60 merged) — this PR completes all 7 items
• Branch: feat/ui-ue-round4-login-polish (per rant: 分支 feat/ui-ue-round4)

Tests

• DOM-stub smoke test — 25/25 assertions pass
• node --check ui/js/app.js
• cargo test — 1 passed
• cargo fmt --check