feat(integrations): dedicated Activity window per macOS HIG, flatten Settings pane

[datlechin]

Summary

Refactors the Integrations area to follow native macOS / Apple HIG: Settings is for preferences only; data viewers and live operational state get their own window.

Before: Settings > Integrations bundled three things into one fixed-size 720×500 pane via a nested segmented Picker:

• preferences (port, auth, network)
• 1,000-row activity log with search/filter/export
• live "Connected Clients" list with disconnect actions
• "Setup Instructions" DisclosureGroup with sub-Picker

This caused layout jitter on refresh (loading state shrank the content area inside the fixed-size Settings window) and violated HIG ("avoid using a Settings window to display information that's accessible elsewhere").

After:

• New window Window > Integrations Activity — resizable NSWindow with NavigationSplitView sidebar (Activity Log / Connected Clients), unified toolbar, native .searchable, filter Menu, refresh, export. Frame autosaved across launches.
• Settings > Integrations is now a flat Form with sections: Integrations · Server Configuration · Authentication · Network · two buttons (Connect a Client… / View Activity…). No more nested picker, no more sub-tabs.
• "Connect a Client" is a sheet (segmented Picker for client + numbered steps + copyable code) instead of a DisclosureGroup buried in Settings.
• Connected Clients list lives in the new window with its own Disconnect toolbar action and context menu.
• Activity Log uses List with rich rows + status indicators + relative time + category badge + outcome badge. Refresh button shows a small spinner inline; the list stays visible during refresh (no jitter, no content flash).

Architecture / HIG notes

• IntegrationsActivityWindowFactory follows the same pattern as WelcomeWindowFactory / ConnectionFormWindowFactory and uses applyAutosaveName(_:) from PR fix(windows): persist welcome, connection form, feedback window positions #985 for native frame autosave.
• NavigationSplitView with sidebar is the modern macOS pattern (Console.app, Mail, Notes). Selection-driven via List(selection:) with tagged Labels.
• Each pane owns its .toolbar { }; SwiftUI bridges items to the window's NSToolbar automatically. Toolbar items swap on sidebar selection.
• .searchable(text:placement: .toolbar) provides the native macOS search field in the toolbar.
• .navigationTitle / .navigationSubtitle set window title + subtitle natively; subtitle shows "Activity is retained for 90 days" or live "N connected" count.
• Old MCPAuditLogView deleted; helpers (AuditEntry row formatting, time-range enum) re-homed into the new pane file as ActivityLogRow and ActivityTimeRange.

Test plan

• App launches; Settings > Integrations renders only the flat Form (no segmented picker, no Activity Log tab). All existing toggles and TextFields still work.
• Click "Connect a Client…" — sheet opens, segmented Picker switches between Claude Desktop / Claude Code / Cursor instructions. Copy buttons on snippets work. "Done" dismisses.
• Click "View Activity…" — opens the new window. Same window opens via Window > Integrations Activity menu item. Both routes focus the existing window if already open.
• Sidebar: switch between "Activity Log" and "Connected Clients". Toolbar items swap accordingly.
• Activity Log: search field in toolbar filters live; filter Menu (Range / Category / Token) re-queries; "Clear Filters" appears when filters active and resets to defaults.
• Activity Log refresh button shows a small spinner during reload; the list stays visible (no jitter, no flash to empty state).
• Activity Log empty states: no entries yet (tray icon), no matching filter (line.3.horizontal.decrease.circle icon), no search match (system search empty state).
• Activity Log right-click on a row: "Copy Details" copies a multi-line summary; "Copy Connection ID" appears when applicable.
• Activity Log Export — opens NSSavePanel, writes valid CSV.
• Connected Clients: shows clients while server is running; empty state when none. Disconnect via toolbar (when row selected) or context menu opens confirmation alert; confirming disconnects the client.
• Window position and size are remembered across app relaunches (frame autosave with key IntegrationsActivityWindow).
• No regressions in unrelated Settings tabs.

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