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/ui_tweaks_and_reactivity.md

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+# Plan - UI Tweaks and Reactive Updates
+
+This plan outlines the changes needed to ensure data reactivity after updates, improve chart visibility with better colors, and enhance the "Latest activity" section with a "show more" functionality.
+
+## 1. Reactive Data Updates
+
+### Analysis
+
+Currently, when a purchase or payment is added in [ledger.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/routes/ledger.tsx), `refreshHouseholdData(true, true)` is called. This function invalidates the TanStack Query cache in [session-context.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/contexts/session-context.tsx), but [DashboardProvider](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/contexts/dashboard-context.tsx) stores data in local signals (`setDashboard`) and does not automatically refetch when the cache is invalidated.
+
+### Proposed Changes
+
+- **session-context.tsx**:
+  - Add a way to register "data listeners" or simply a list of refresh callbacks.
+  - Update `refreshHouseholdData` to execute these callbacks.
+- **dashboard-context.tsx**:
+  - In `DashboardProvider`, register `loadDashboardData` as a listener in the session context on mount.
+- **App.tsx**:
+  - Ensure `DashboardProvider` is correctly integrated with the session's refresh mechanism.
+
+## 2. Chart Colors Improvement
+
+### Analysis
+
+Current chart colors in [dashboard-context.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/contexts/dashboard-context.tsx) and [theme.css](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/theme.css) are somewhat similar, making them hard to distinguish.
+
+### Proposed Changes
+
+- **dashboard-context.tsx**:
+  - Update `chartPalette` with more distinct, high-contrast colors.
+  - Proposed palette: `#3ecf8e` (Emerald), `#3b82f6` (Blue), `#ef4444` (Red), `#f59e0b` (Amber), `#8b5cf6` (Violet), `#ec4899` (Pink).
+- **theme.css**:
+  - Update `--chart-1` through `--chart-6` variables to match the new palette for consistency across the app.
+
+## 3. "Show More" for Latest Activity
+
+### Analysis
+
+The "Latest activity" section in [home.tsx](file:///Users/whekin/Projects/kojori-tg-bot/apps/miniapp/src/routes/home.tsx) currently only shows the first 5 entries of the ledger.
+
+### Proposed Changes
+
+- **home.tsx**:
+  - Add a local signal `showAllActivity` (default `false`).
+  - Update the `For` loop to show either `slice(0, 5)` or the full `ledger` based on the signal.
+  - Add a "Show more" button that appears if `ledger.length > 5`.
+  - Style the button to match the app's UI.
+- **i18n.ts**:
+  - Add translations for "Show more" and "Show less" (or "Collapse").
+
+## Verification Plan
+
+### Automated Tests
+
+- Since this is mostly UI/UX, manual verification in the browser is preferred.
+- Check if `invalidateQueries` is called after adding a purchase (can be checked via network tab).
+
+### Manual Verification
+
+1.  **Reactivity**: Add a purchase and verify that the dashboard balances and "Latest activity" update immediately without manual page refresh.
+2.  **Chart Colors**: Navigate to the balances page and verify that chart slices are easily distinguishable.
+3.  **Show More**: On the home page, ensure "Show more" appears when there are > 5 activities and correctly expands the list.