Add request/response history tracking

[kashifpk]

Summary

Implement full request/response history tracking in the Web UI to help debug MCP interactions.

Background

Currently Anvil only shows the last request/response in the debug panel. The official MCP Inspector maintains a full history of all interactions, which is invaluable for debugging.

Proposed Implementation

Web UI Features

• History Panel: Dedicated tab or sidebar showing all requests
• Entry Details: Each entry shows:
  • Timestamp
  • Method name (e.g., tools/call, resources/list)
  • Status (success/error)
  • Duration (ms)
• Detail View: Click entry to see full request/response JSON
• Filtering: Filter by method type, status, or search text
• Clear History: Button to clear all history
• Export: Option to export history as JSON for bug reports

Data Structure

historyEntry = {
  id: number,
  timestamp: Date,
  method: string,
  params: object,
  response: object,
  duration: number,  // milliseconds
  status: 'success' | 'error',
  error: string | null
}

UI Layout Options

1. Dedicated Tab: Add "History" tab alongside Tools/Resources/Prompts
2. Sidebar: Collapsible sidebar on the right showing recent requests
3. Enhanced Debug Panel: Expand current debug panel into scrollable history

Recommend Option 1 (Dedicated Tab) for best UX.

Storage

• Store in Vue reactive array (in-memory)
• Optional: Persist to sessionStorage for page refresh survival
• Limit to last N entries (e.g., 100) to prevent memory issues

Acceptance Criteria

• All MCP requests logged to history
• History viewable in dedicated UI section
• Click to view full request/response details
• Filter/search functionality
• Clear history button
• Export to JSON option
• Memory-efficient (limit stored entries)

Mockup

┌─────────────────────────────────────────────────────────────┐
│ History                                         [Clear All] │
├─────────────────────────────────────────────────────────────┤
│ 🟢 14:32:05  tools/call (get_weather)              45ms    │
│ 🟢 14:32:01  tools/list                            12ms    │
│ 🟢 14:31:58  resources/list                         8ms    │
│ 🔴 14:31:55  tools/call (invalid_tool)            102ms    │
│ 🟢 14:31:50  initialize                            23ms    │
└─────────────────────────────────────────────────────────────┘