docs: add frontend component hierarchy map for dashboard pages

frontend/docs/FRONTEND_COMPONENT_HIERARCHY.md

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+# Frontend Component Hierarchy
+
+This document describes the high-level component hierarchy and responsibilities for the primary dashboard view.
+
+---
+
+# Dashboard Component Tree
+
+```
+VaultDashboard
+│
+├── Transaction Confirmation Modal
+│
+├── Vault Statistics Panel
+│   ├── ApiStatusBanner
+│   ├── Dashboard Header
+│   ├── Vault Metrics
+│   └── Refresh / Status Indicators
+│
+├── VaultCapWarning
+│
+├── SharePriceDisplay
+│
+├── VaultPerformanceChart
+│
+├── Transaction Tabs
+│   ├── Deposit
+│   ├── Withdraw
+│   └── Step Indicator
+│       ├── Amount
+│       ├── Review
+│       └── Result
+│
+├── Transaction Forms
+│
+├── Validation & Error States
+│
+├── Toast Notifications
+│
+└── Transaction Conflict Resolution
+```
+
+---
+
+# Component Responsibilities
+
+## VaultDashboard
+
+The main dashboard container responsible for:
+
+- Fetching vault data
+- Managing dashboard state
+- Coordinating transactions
+- Rendering all dashboard sections
+- Managing loading and error states
+
+---
+
+## Transaction Confirmation Modal
+
+Displays a confirmation dialog before sensitive user actions such as deposits and withdrawals.
+
+Responsibilities:
+
+- Transaction confirmation
+- Prevent accidental submissions
+- Display transaction summary
+
+---
+
+## Vault Statistics Panel
+
+Displays overall vault information.
+
+Responsibilities:
+
+- TVL
+- APY
+- Vault summary
+- Refresh status
+- Loading skeletons
+
+---
+
+## ApiStatusBanner
+
+Displays API and backend connectivity errors.
+
+Responsibilities:
+
+- Network error display
+- Backend availability status
+- User-friendly error messaging
+
+---
+
+## VaultCapWarning
+
+Warns users when the vault approaches or reaches capacity.
+
+Responsibilities:
+
+- Capacity utilization
+- Deposit restrictions
+- Visual warning state
+
+---
+
+## SharePriceDisplay
+
+Displays the current vault share price.
+
+Responsibilities:
+
+- Current share value
+- Price formatting
+- Live updates
+
+---
+
+## VaultPerformanceChart
+
+Visualizes vault performance over time.
+
+Responsibilities:
+
+- Historical performance
+- Performance trends
+- User insight
+
+---
+
+## Transaction Tabs
+
+Allows switching between available transaction types.
+
+Responsibilities:
+
+- Deposit flow
+- Withdrawal flow
+- Preserve dashboard state
+
+---
+
+## Step Indicator
+
+Guides users through the transaction process.
+
+Steps:
+
+1. Amount
+2. Review
+3. Result
+
+---
+
+## Transaction Forms
+
+Collects user input.
+
+Responsibilities:
+
+- Amount validation
+- Balance checking
+- Slippage configuration
+- Fee estimation
+
+---
+
+## Validation & Error Handling
+
+Provides client-side and server-side validation.
+
+Responsibilities:
+
+- Form validation
+- API validation
+- Display field errors
+- Prevent invalid submissions
+
+---
+
+## Toast Notifications
+
+Displays transaction feedback.
+
+Responsibilities:
+
+- Success notifications
+- Error notifications
+- Warning notifications
+
+---
+
+## Transaction Conflict Resolution
+
+Handles stale transactions and conflicting state.
+
+Responsibilities:
+
+- Detect stale submissions
+- Retry flow
+- Intent refresh
+- Conflict resolution
+
+---
+
+# Notes
+
+The dashboard centralizes transaction management while delegating visualization, validation, and feedback to dedicated child components. This separation keeps business logic isolated from reusable UI components and improves maintainability.