feat: add quick payment action and improve copy button UX

Mini App Home Screen:
- Add 'Record Payment' button to utilities and rent period cards
- Pre-fill payment amount with member's share (rentShare/utilityShare)
- Modal dialog with amount input and currency display
- Toast notifications for copy and payment success/failure feedback

Copy Button Improvements:
- Increase spacing between icon and text (4px → 8px)
- Add hover background and padding for better touch target
- Green background highlight when copied (in addition to icon color change)
- Toast notification appears when copying any value

Backend:
- Add /api/miniapp/payments/add endpoint for quick payments
- Payment notifications sent to 'reminders' topic in Telegram
- Include member name, payment type, amount, and period in notification

Files:
- New: apps/miniapp/src/components/ui/toast.tsx
- Modified: apps/miniapp/src/routes/home.tsx, apps/miniapp/src/index.css,
  apps/miniapp/src/theme.css, apps/miniapp/src/i18n.ts,
  apps/bot/src/miniapp-billing.ts, apps/bot/src/server.ts

Quality Gates: ✅ format, lint, typecheck, build, test

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

.trae/documents/plan-home-no-payment-and-qa-overrides.md

@@ -0,0 +1,60 @@
+# Plan: Fix Home “No Payment” + Add QA Period Overrides
+
+## Goals
+
+- Remove the “Due” chip from the **No payment period** card.
+- In **No payment period**, don’t show rent/utilities balances; show only purchase-related balance and household info (FX if available).
+- Fix “Upcoming” dates so they never show negative days (e.g., “-11d left”); if the reminder/warning already passed in the current period, show the next period’s start date instead.
+- Add **period/date overrides** to the hidden QA “Testing view” so you can reliably test all Home variants.
+
+## Changes
+
+### 1) Home: remove “Due” chip from No-payment card
+
+- In [home.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/routes/home.tsx), stop rendering the `focusBadge()` inside the `mode() === 'none'` card.
+- Keep the existing Due/Settled chip behavior for utilities/rent modes unchanged.
+
+### 2) Home: No-payment mode shows purchases-only balance
+
+- In [home.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/routes/home.tsx):
+  - When `homeMode() === 'none'`, hide the current “Your balance” card (which includes rent + utilities).
+  - Replace it with a purchases-focused card that shows:
+    - Member purchase offset (from `currentMemberLine().purchaseOffsetMajor`) as the primary amount.
+    - Household purchase totals (count + sum) computed from the existing dashboard ledger entries where `kind === 'purchase'`.
+    - Household member count (from dashboard member lines length).
+  - Keep household informational cards that are not “due/balance for rent/utilities” (e.g., the FX card if present/available).
+
+### 3) Home: Upcoming utilities/rent start date never goes negative
+
+- Update upcoming calculations in No-payment mode:
+  - If `daysUntilPeriodDay(period, reminderDay, timezone)` is `>= 0`, show as-is.
+  - If it is `< 0`, compute the next period (`BillingPeriod.fromString(period).next().toString()`) and compute:
+    - `formatPeriodDay(nextPeriod, reminderDay, locale)`
+    - `daysUntilPeriodDay(nextPeriod, reminderDay, timezone)`
+  - Apply the same logic for rent warning day and utilities reminder day.
+- This ensures “Utilities starts …” always points to a future date and shows a non-negative countdown.
+
+### 4) QA Testing View: add period/date overrides
+
+- Extend the existing hidden “Testing view” (opened by 5 taps on the role badge) in:
+  - [shell.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/components/layout/shell.tsx)
+  - [dashboard-context.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/contexts/dashboard-context.tsx)
+- Add two optional overrides stored in `DashboardContext`:
+  - `testingPeriodOverride?: string | null` (format `YYYY-MM`)
+  - `testingTodayOverride?: string | null` (format `YYYY-MM-DD`)
+- Home uses `effectivePeriod = testingPeriodOverride ?? dashboard.period`.
+- Date helpers used by Home (`daysUntilPeriodDay`, `compareTodayToPeriodDay`) accept an optional “today override” so Home can behave as if it’s a different day without changing system time.
+
+### 5) Copy updates
+
+- Add/adjust i18n strings needed for the purchases-only card and QA fields in:
+  - [i18n.ts](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/i18n.ts)
+
+## Verification
+
+- Run: `bun run format:check`, `bun run lint`, `bun run typecheck`, `bun run test`, `bun run build`
+- Manual checks in miniapp:
+  - Set QA overrides to land inside utilities window / rent window / no-payment window and confirm Home variant changes.
+  - Confirm no-payment “Upcoming” countdown never shows negative values.
+  - Confirm no-payment mode hides rent/utilities balance and no longer shows “Due” chip on that card.
+  - Confirm no-payment mode shows purchase offset + household purchase stats + member count.