feat: dashboard restructure, integrations, settings, UI fixes

Dashboard:
- Split into components (kpi-cards, agent-table, missed-queue)
- Add collapsible AI panel on right (same pattern as Call Desk)
- Add tabs: Agent Performance | Missed Queue | Campaigns
- Date range filter in header

Integrations page:
- Ozonetel (connected), WhatsApp, Facebook, Google, Instagram, Website, Email
- Status badges, config details, webhook URL with copy button

Settings page:
- Employee table from workspaceMembers GraphQL query
- Name, email, roles, status, reset password action

Fixes:
- Fix CALLS_QUERY: callerNumber needs { primaryPhoneNumber }, recordingUrl → recording { primaryLinkUrl }
- Remove duplicate AI Assistant header
- Remove Follow-ups from CC agent sidebar (already in worklist tabs)
- Remove global search from TopBar (decorative, unused)
- Slim down TopBar height
- Fix search/table gap in worklist
- Add brand border to active nav item

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/application/app-navigation/base-components/nav-item.tsx

@@ -6,7 +6,7 @@ import { cx, sortCx } from "@/utils/cx";
 
 const styles = sortCx({
     root: "group relative flex w-full cursor-pointer items-center rounded-md bg-primary outline-focus-ring transition duration-100 ease-linear select-none hover:bg-primary_hover focus-visible:z-10 focus-visible:outline-2 focus-visible:outline-offset-2",
-    rootSelected: "bg-active hover:bg-secondary_hover",
+    rootSelected: "bg-active hover:bg-secondary_hover border-l-2 border-l-brand-600 text-brand-secondary",
 });
 
 interface NavItemBaseProps {