fix: UI polish — nav labels, date picker, rules engine, error messages

- Sidebar: removed "Master" from nav labels (Leads, Patients, Appointments, Call Log)
- Appointment form: Dept + Doctor in 2-col row, Date below, disabled cascade
- DatePicker: placement="bottom start" + shouldFlip fixes popover positioning
- Team Performance: default to "Week", grid KPI cards, chart legend spacing
- Rules Engine: manual save (removed auto-debounce), Reset to Defaults uses
  DEFAULT_PRIORITY_CONFIG (no template endpoint), removed dead saveTimerRef
- Automation rules: 6 showcase cards with trigger/condition/action, replaced
  agent-specific rule with generic round-robin
- Recording analysis: friendly error message with retry instead of raw Deepgram error
- Sidebar active/hover: brand color reference for theming

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

src/components/layout/sidebar.tsx

@@ -69,10 +69,10 @@ const getNavSections = (role: string): NavSection[] => {
                 { label: 'Live Call Monitor', href: '/live-monitor', icon: IconTowerBroadcast },
             ]},
             { label: 'Data & Reports', items: [
-                { label: 'Lead Master', href: '/leads', icon: IconUsers },
-                { label: 'Patient Master', href: '/patients', icon: IconHospitalUser },
-                { label: 'Appointment Master', href: '/appointments', icon: IconCalendarCheck },
-                { label: 'Call Log Master', href: '/call-history', icon: IconClockRewind },
+                { label: 'Leads', href: '/leads', icon: IconUsers },
+                { label: 'Patients', href: '/patients', icon: IconHospitalUser },
+                { label: 'Appointments', href: '/appointments', icon: IconCalendarCheck },
+                { label: 'Call Log', href: '/call-history', icon: IconClockRewind },
                 { label: 'Call Recordings', href: '/call-recordings', icon: IconFileAudio },
                 { label: 'Missed Calls', href: '/missed-calls', icon: IconPhoneMissed },
             ]},