Show notification for unknown MCP tools after 8 extension opens

[Copilot]

When unknown MCP tools are detected (tools with no friendly name mapping), surface a dismissable VS Code notification that navigates the user to the Usage Analysis view and highlights the "Report Unknown Tools" button. Notification is gated behind 8 extension opens to avoid noise before the user has meaningful usage data.

Extension (src/extension.ts)

• getUnknownMcpToolsFromStats() — collects MCP tool IDs across all three time periods and filters for any not present in toolNameMap
• showUnknownMcpToolsBanner() — dismissable notification with its own independent open counter (extension.unknownMcpOpenCount, threshold: 8) and dismissed key (news.unknownMcpTools.v1.dismissed); on "Open Usage Analysis" click, opens the panel then posts highlightUnknownTools to the webview after a 500ms render delay
• Called after showFluencyScoreNewsBanner() in all three startup paths

Webview (src/webview/usage/main.ts)

• Adds id="unknown-mcp-tools-section" to the unknown tools container so it can be targeted
• Handles incoming highlightUnknownTools message: smooth-scrolls to the element and applies a 2-second var(--vscode-focusBorder) glow

case 'highlightUnknownTools': {
    const el = document.getElementById('unknown-mcp-tools-section');
    if (el) {
        el.scrollIntoView({ behavior: 'smooth', block: 'center' });
        el.style.transition = 'box-shadow 0.3s ease';
        el.style.boxShadow = '0 0 0 3px var(--vscode-focusBorder)';
        setTimeout(() => { el.style.boxShadow = ''; }, 2000);
    }
    break;
}

A separate counter is used (rather than reusing extension.openCount) because that counter stops incrementing once the fluency banner is dismissed.

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