feat(ui): detail consistency — inline errors in editors, unified phrasing (v1.17 G)

[argszero]

Summary

Rant 2026-08-17T16:57:17 (UI/UE 多角度深化优化), item G — 细节一致性 (final item): consistency audit of number/amount formatting, 已用/额度 display, button sizing, and inline-editor error handling.

Audit results (already consistent ✓)

• All numeric/amount displays go through D.fmt() (thousand separators / 2 decimals) — sidebar balance, stat cards, tables, wallet all uniform;
• 已用/额度 displayed uniformly; table action buttons all use the small variant (padding:4px 10px;font-size:12px).

Fixes applied

• Inline editors now use inline errors (align with item E): inlineForm validate failure switched from toast-only to setFieldError (red border + inline text, auto-clear) — covers API Key rename, operator topup, member topup;
• Removed the 3 stale「（未生效）」suffixes from those messages;
• Sub-text font-size unified (raise-request email 11px → 12px);
• Listing toast unit phrasing unified to「点/1M（自动）」.

Acceptance

All 7 items (A–G) of rant 16:57:17 now satisfied — PRs #41–#47, docs v1.17.

Tests

• node --check on app.js — syntax OK
• DOM-stub init smoke + field-error smoke (5/5) — all previous behavior intact
• cargo test — 1 passed
• cargo fmt --check — clean