fix: standardize card/list action buttons and hover states (refs #51)

- Documents page: Convert from text buttons to icon buttons (Eye for
  View Details, Trash for Delete), add card hover shadow effect,
  convert to MUI components for consistency
- Fuel Logs: Add row hover background effect on list items
- Maintenance Records: Add card hover shadow effect
- Maintenance Schedules: Add card hover shadow effect

All changes follow the VehicleCard pattern with:
- Light gray shadow/elevation on hover with 0.2s transition
- Consistent icon button styling with mobile-responsive touch targets
- Proper MUI component usage throughout

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/features/maintenance/components/MaintenanceRecordsList.tsx

@@ -86,7 +86,16 @@ export const MaintenanceRecordsList: React.FC<MaintenanceRecordsListProps> = ({
           const subtypeCount = record.subtypeCount || record.subtypes?.length || 0;
 
           return (
-            <Card key={record.id} variant="outlined">
+            <Card
+              key={record.id}
+              variant="outlined"
+              sx={{
+                '&:hover': {
+                  boxShadow: 3,
+                },
+                transition: 'box-shadow 0.2s ease-in-out',
+              }}
+            >
               <CardContent>
                 <Box
                   sx={{

frontend/src/features/maintenance/components/MaintenanceSchedulesList.tsx

@@ -170,7 +170,16 @@ export const MaintenanceSchedulesList: React.FC<MaintenanceSchedulesListProps> =
           const reminderDisplay = getReminderDisplay(schedule);
 
           return (
-            <Card key={schedule.id} variant="outlined">
+            <Card
+              key={schedule.id}
+              variant="outlined"
+              sx={{
+                '&:hover': {
+                  boxShadow: 3,
+                },
+                transition: 'box-shadow 0.2s ease-in-out',
+              }}
+            >
               <CardContent>
                 <Box
                   sx={{