feat(badges): add 4×6 fanfold layout CSS for Epson single-sided stock

Introduces badge_layout_epson_4x6_fanfold.css (layout code badge_4x6_fanfold)
for the Axonius Adapt 2026 June show. Wires @page size to 4in×6in in the print
page and cleans up the stale 4in×12in default. Imports new CSS in badge component.
Measured stock: 4in × 6in portrait with 5/8in lanyard hole 1/4in from top.

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

documentation/MODULE__AE_Events_Badge_Templates.md

@@ -180,7 +180,7 @@ The `layout` field encodes physical badge stock dimensions. Standard codes to us
 | --- | --- | --- | --- |
 | `badge_4x5_fanfold` | 4" × 5" (101.6 × 127mm) | `badge_layout_epson_4x5_fanfold.css` | Epson ColorWorks C3500 / ExpoBadge fanfold — preferred for general conference use (ISHLT, demos) |
 | `badge_3.5x5.5_pvc` | 3.5" × 5.5" (88.9 × 139.7mm) | `badge_layout_zebra_zc10l_pvc.css` | PVC card, Zebra ZC10L — single-sided, set `duplex=0` |
-| `badge_4x6_fanfold` | 4" × 6" (101.6 × 152.4mm) | *(none — Tailwind defaults)* | Generic fanfold fallback; dimensions match the hardcoded Tailwind values |
+| `badge_4x6_fanfold` | 4" × 6" (101.6 × 152.4mm) | `badge_layout_epson_4x6_fanfold.css` | Single-sided fanfold; Axonius Adapt 2026 (June 2026). Lanyard hole: 5/8in × 1/8in, centered, 1/4in from top. |
 | `badge_4x6_fanfold_tickets` | 4" × 6" + tear-offs | *(pending)* | Fanfold with ticket stubs |
 
 Layout CSS files live in `src/lib/ae_events/badges/css/` and are imported by
@@ -359,6 +359,7 @@ Firefox users can use "Save to PDF" directly — it just works.
 - [x] Wire `style_href` via `<svelte:head>` in print page — done in `print/+page.svelte`; also in `properties_to_save`. (2026-03-18 verified)
 - [x] Add `duplex` to `properties_to_save` — done. (2026-03-18 verified)
 - [x] Add `duplex`-driven suppression to `badge_back` section — done in `ae_comp__badge_obj_view.svelte`; `show_badge_back` derived from `duplex` field.
-- [ ] Make `layout` field drive actual card dimensions in the badge component — currently the Zebra ZC10L layout CSS (`badge_layout_zebra_zc10l_pvc.css`) sets dimensions correctly via `[data-layout="..."]` scoping, but fanfold layouts still use Tailwind defaults. Needs proper CSS for each layout code.
+- [x] `badge_4x6_fanfold` layout CSS created (`badge_layout_epson_4x6_fanfold.css`), imported in badge component, `@page 4in 6in` wired in print page. (2026-05-15)
+- [ ] `badge_4x5_fanfold` layout CSS exists but is stale (not used in 2+ years) — review against actual hardware before next use.
 - [ ] Remove dead `exhibitor_info` / `presenter_info` / `staff_info` / `vip_info` / `vote_info` `{#if}` blocks from `ae_comp__badge_obj_view.svelte` (if they were carried over from v1)
 - [ ] Improve `ae_comp__badge_template_form.svelte` to edit all relevant fields (currently minimal)