fix(ui): tx table token K/M abbreviation + hover exact + summary right-align + key type label (rant 2026-08-22T08:58:54)

[argszero]

Summary

Transaction-page UE/UI polish (host screenshot-based feedback on v0.7.6 dev, rant 2026-08-22T08:58:54):

Related Rant

• 2026-08-22T08:58:54 — 交易记录页 UE/UI 优化（基于宿主 2026-08-22 截图实测）

Changes

• Token K/M abbreviation — fmtTokens now renders ≥1000 as X.XK and ≥1e6 as X.XM (previously only ≥1e6 became M, leaving thousands like 34313 / 32896 as raw numbers). Hovering a token cell shows the exact value via a title tooltip.
• Summary bar alignment — .tx-summary .ts-item now align-items: flex-end so each value (income / expense / net) is right-aligned and visually tidy (already using tabular-nums).
• Key column fallback — rows with no key_label now show the transaction-type label for non-keyed types (topup / gift / withdraw) instead of a bare —; consume/earn without a key still show —.
• Filter layout note — the four token columns keep their number-range filters (compact via existing .range-filter CSS); the summary already renders the K/M token stats.

Tests

• Frontend-only: node --check on ui/js/app.js + ui/js/i18n.js OK; cargo test 139/139 passed; fmt clean; cache-bust bumped to 20260822-3

Acceptance

• Token columns use K/M abbreviation with exact-value hover
• Summary income/expense/net values right-aligned
• Summary shows token stats (M/K units) — already backed by summary endpoint
• Key column shows key_label or transaction type for non-keyed rows
• Reconciliation formula confirmed exact per row (input = tokens - cached - output); the screenshot diff was a cross-row summary-vs-row comparison, not a backend bug
• 139/139 + fmt + clippy green