Badges: use position:fixed for print centering — bypasses all ancestor layout issues

src/routes/events/[event_id]/(badges)/badges/[badge_id]/print/+page.svelte

@@ -162,41 +162,29 @@
     <style>
         @media print {
             /* Full-page reset.
-               app.css sets `overflow: hidden` on html + body globally — override it
-               so body/html fill the full page (not just the badge width). */
+               app.css sets overflow:hidden on html + body — override so they don't
+               create BFCs that shrink to content. */
             html, body {
                 display: block !important;
                 width: 100% !important;
-                height: 100% !important;
+                overflow: visible !important;
                 margin: 0 !important;
                 padding: 0 !important;
-                overflow: visible !important;
             }
 
-            /* Hide app chrome */
+            /* Hide all app chrome */
             .submenu { display: none !important; }
 
-            /* #ae_main_content becomes the positioning context for the badge.
-               It fills the full page (100%×100%), and the badge is absolutely
-               centered within it.
-
-               Why not flex: Firefox respects the printer driver's minimum hardware
-               margins even with @page { margin: 0 }. This makes the available
-               content area slightly smaller than 100%, throwing off flex centering.
-               CSS transform-based centering (translate -50%,-50%) is immune to
-               this: it centers relative to the containing block dimension, which
-               Firefox computes correctly even when printer margins are applied.
-
-               Why not display:contents on this element: #ae_main_content has
-               overflow:auto. Per spec, display:contents cannot override an element
-               with overflow clipping; Firefox keeps it as a block box. We reset it
-               to a positioned block instead. */
+            /* #ae_main_content: make it a transparent, non-interfering passthrough block.
+               We cannot use display:contents here — it has overflow:auto, and per spec
+               display:contents cannot override overflow-clipping elements (Firefox
+               enforces this strictly). We just strip its visual/layout effects instead. */
             #ae_main_content {
-                position: relative !important;
                 display: block !important;
+                position: static !important;
                 width: 100% !important;
                 max-width: none !important;
-                height: 100% !important;
+                height: auto !important;
                 min-height: 0 !important;
                 overflow: visible !important;
                 background: transparent !important;
@@ -205,26 +193,37 @@
             }
 
             /* .main_content and #badge_render_area have no overflow constraints,
-               so display:contents dissolves their boxes in all browsers.
-               .event_badge_wrapper emerges as a direct child of #ae_main_content. */
+               so display:contents safely dissolves their boxes in all browsers. */
             .main_content,
             #badge_render_area {
                 display: contents !important;
             }
 
-            /* Center the badge using CSS transforms — the most reliable cross-browser
-               print centering method; unaffected by printer margin variations. */
+            /* Center badge using position:fixed.
+               Why fixed instead of absolute/flex:
+               - position:fixed in print positions relative to the @page content area,
+                 completely bypassing the ancestor hierarchy (no containing-block height
+                 dependency, no overflow-clip interference, no flex-parent issues).
+               - top/left:50% + translate(-50%,-50%) centers within the page content area.
+               - Firefox applies physical printer hardware margins even with @page{margin:0};
+                 this shrinks the content area slightly but top:50%/left:50% still centers
+                 within whatever area the browser gives us — it's immune to asymmetric margins.
+               - Chrome: identical behavior to absolute+flex centering but more robust.
+               - min-height:0 overrides the Tailwind min-h-[6.0in] class on this wrapper;
+                 badge_front/back provide their own dimensions. */
             .event_badge_wrapper {
-                position: absolute !important;
+                position: fixed !important;
                 top: 50% !important;
                 left: 50% !important;
                 transform: translate(-50%, -50%) !important;
+                min-height: 0 !important;
+                max-width: none !important;
                 margin: 0 !important;
                 padding: 0 !important;
                 gap: 0 !important;
             }
 
-            /* Never split the front or back across pages */
+            /* Never split front/back across pages */
             .badge_front,
             .badge_back {
                 break-inside: avoid;
@@ -242,7 +241,7 @@
                 outline: 4px solid blue !important;
                 outline-offset: -4px !important;
             }
-            /* Red = #ae_main_content — should be VISIBLE and fill the page (same as blue). */
+            /* Red = #ae_main_content — block passthrough, should fill page width/height. */
             #ae_main_content {
                 outline: 3px dashed red !important;
                 outline-offset: -6px !important;
@@ -256,7 +255,7 @@
                 outline: 3px dashed purple !important;
                 outline-offset: -12px !important;
             }
-            /* Cyan = the actual badge — should be dead-center */
+            /* Cyan = the actual badge — should be dead-center on page */
             .event_badge_wrapper {
                 outline: 3px solid cyan !important;
                 outline-offset: 2px !important;