Filter panel UX refinements: headings, layout, location chip, padding

- DialogShell: bump px from 3 to 5 (20px) for more breathing room
- FilterPanel: "Done" → "Apply", move "Clear all" to footer as "Reset filters"
- ProvidersStep filters:
  - Section headings: labelLg + fontWeight 600 for visual hierarchy
  - Funeral type chips: horizontal scroll instead of wrap
  - Location section: chip showing current search + editable input
  - Price inputs: compact fontSize 0.875rem + tighter padding
  - Service tradition: 'None' added as first option
  - Active count includes location search
  - Reset clears search query too

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

src/components/atoms/DialogShell/DialogShell.tsx

@@ -108,7 +108,7 @@ export const DialogShell = React.forwardRef<HTMLDivElement, DialogShellProps>(
             display: 'flex',
             alignItems: 'center',
             justifyContent: 'space-between',
-            px: 3,
+            px: 5,
             pt: 2.5,
             pb: 2,
             flexShrink: 0,
@@ -149,7 +149,7 @@ export const DialogShell = React.forwardRef<HTMLDivElement, DialogShellProps>(
         {/* Scrollable body */}
         <Box
           sx={{
-            px: 3,
+            px: 5,
             py: 2.5,
             overflowY: 'auto',
             flex: 1,
@@ -162,7 +162,7 @@ export const DialogShell = React.forwardRef<HTMLDivElement, DialogShellProps>(
         {footer && (
           <>
             <Divider />
-            <Box sx={{ px: 3, py: 2, flexShrink: 0 }}>{footer}</Box>
+            <Box sx={{ px: 5, py: 2, flexShrink: 0 }}>{footer}</Box>
           </>
         )}
       </Dialog>