Batch 3: FilterPanel molecule + integration across 3 steps (D-C, D-F)

New molecule:
- FilterPanel: Popover-based reusable filter trigger with active
  count badge, Clear all, Done actions. D-C: Popover for MVP.

Step integrations:
- ProvidersStep: inline Chip filter bar → FilterPanel Popover,
  search bar + filter button side-by-side in sticky header
- VenueStep: same pattern, filter chips moved into Popover
- CoffinsStep (D-F): grid-sidebar layout → wide-form (full-width
  4-col grid), category + price selects moved into FilterPanel

WizardLayout:
- Added wide-form variant (maxWidth lg, single column) for
  card grids that benefit from full width
- wide-form included in STEPPER_VARIANTS for progress bar

Storybook:
- FilterPanel stories: Default, WithActiveFilters, SelectFilters,
  CustomLabel

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

docs/memory/session-log.md

@@ -26,6 +26,35 @@ Each entry follows this structure:
 
 ## Sessions
 
+### Session 2026-03-29e — Feedback iteration Batches 1 & 2
+
+**Agent(s):** Claude Opus 4.6 (1M context)
+
+**Work completed:**
+- **Batch 1: Atom + Template Foundation**
+  - ToggleButtonGroup: label-to-options spacing `mb: 1→2`, top-align content `flex-start`, fixed selected border CSS specificity (added `&.Mui-selected` in grouped selector)
+  - Heading standardisation: all 6 split-layout steps changed from `h4` → `display3` (ProvidersStep, PackagesStep, PreviewStep, VenueStep, CoffinsStep, CoffinDetailsStep) per D-A
+  - DateTimeStep: normalised section gaps (scheduling fieldset `mb: 3→4`)
+  - CrematoriumStep: added subheading for consistency, normalised witness section `mb: 3→4`
+  - PackagesStep + DateTimeStep: fixed input label clipping (`pt: 0.5` on TextField containers)
+- **Batch 2: List-Map Layout Rework (D-B)**
+  - WizardLayout ListMapLayout: 420px fixed left column, `flex: 1` right panel
+  - Back link rendered inside left panel (not above split) — eliminates gap above map
+  - LAYOUT_MAP type updated to accept `backLink` prop for list-map variant
+  - ProvidersStep + VenueStep: sticky header (heading + search + filters pinned at top of scrollable left panel)
+
+**Decisions made:**
+- None new (implementing D-A heading standardisation and D-B list-map layout from previous session)
+
+**Open questions:**
+- None
+
+**Next steps:**
+- Batch 3: FilterPanel component (reusable Popover-based filter for providers, venues, coffins)
+- Remaining batches 4–7 from iteration plan
+
+---
+
 ### Session 2026-03-29c — Grooming pass: critique/harden/polish all 15 steps
 
 **Agent(s):** Claude Opus 4.6 (1M context)