Fix MCP tool detection from toolNames.json

[Copilot]

MCP tools in toolNames.json (e.g., mcp.io.github.git.assign_copilot_to_issue, mcp_io_github_git_pull_request_read) were misclassified as regular tool calls, causing incorrect statistics in usage analysis and file viewer.

Changes

Added detection logic

• isMcpTool(): Identifies MCP tools by mcp. or mcp_ prefix
• extractMcpServerName(): Extracts server identifier from tool name (e.g., mcp.io.github.tool → io)

Updated tool processing (4 locations)

• JSONL event processing (CLI format)
• JSON response processing (VS Code format)
• Log viewer turn extraction
• extractResponseData() helper

// Before: All tools counted as regular tool calls
if (event.type === 'tool.call') {
  analysis.toolCalls.total++;
  analysis.toolCalls.byTool[toolName] = ...;
}

// After: MCP tools routed to MCP statistics
if (this.isMcpTool(toolName)) {
  analysis.mcpTools.total++;
  const serverName = this.extractMcpServerName(toolName);
  analysis.mcpTools.byServer[serverName] = ...;
  analysis.mcpTools.byTool[toolName] = ...;
} else {
  analysis.toolCalls.total++;
  analysis.toolCalls.byTool[toolName] = ...;
}

MCP tools now appear correctly in MCP-specific statistics and UI sections instead of being mixed with regular tool calls.

Original prompt

Look at the proposed changes in #187, and recreate them in a new PR. We ran into so many merge conflicts that we need to rebase instead

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