feat: Reminder Manager UX — timeline-first grouped layout

Replace 3-row filter panel with a grouped feed (Überfällig / Diese Woche /
Dieser Monat / Später). KPI cards are now clickable shortcuts that filter to
their time horizon or type (Pre-Market). Filter bar condenses to one row:
search + type dropdown + archive toggle. Rows get a left priority-color
border (red/orange/yellow). Default status filter is ACTIVE+SNOOZED.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/supply/ReminderListRow.tsx

@@ -7,7 +7,14 @@ import { ReminderTypeBadge } from './ReminderTypeBadge'
 import { ReminderDaysIndicator } from './ReminderDaysIndicator'
 import { useCompleteReminder, useDismissReminder, useSnoozeReminder } from '../../hooks/useReminders'
 import { useReminderStore } from '../../stores/reminderStore'
-import { ReminderStatus } from '../../domain/reminder'
+import { ReminderStatus, ReminderPriority } from '../../domain/reminder'
+
+const PRIORITY_BORDER: Record<string, string> = {
+  [ReminderPriority.URGENT]: '#dc2626',
+  [ReminderPriority.HIGH]: '#ea580c',
+  [ReminderPriority.MEDIUM]: '#ca8a04',
+  [ReminderPriority.LOW]: 'transparent',
+}
 
 const STATUS_CHIP_COLOR: Record<string, 'default' | 'success' | 'warning' | 'error' | 'info'> = {
   ACTIVE: 'info',
@@ -56,6 +63,8 @@ export const ReminderListRow = memo(function ReminderListRow({ reminder }: Props
     snooze.mutate({ id: reminder.id, until: '2026-05-27' })
   }
 
+  const borderColor = PRIORITY_BORDER[reminder.priority] ?? 'transparent'
+
   return (
     <Box
       onClick={handleRowClick}
@@ -64,9 +73,11 @@ export const ReminderListRow = memo(function ReminderListRow({ reminder }: Props
         gridTemplateColumns: '100px 130px 1fr 140px 90px 100px 90px',
         alignItems: 'center',
         gap: 1,
-        px: 2,
+        pl: 1.5,
+        pr: 2,
         py: 1.25,
         borderBottom: '1px solid #f1f5f9',
+        borderLeft: `3px solid ${borderColor}`,
         bgcolor: 'white',
         cursor: 'pointer',
         '&:hover': { bgcolor: '#f8fafc' },