Cap NewsletterModal's width through Tablet instead of just stacking it

Stacking single-column at lg: (previous attempt) let the dialog stretch
to near-full-viewport-width at real Tablet widths, since max-w-[75rem]
barely constrains it there — the photo blew up huge and the text below
read as lost/disconnected. Caps the dialog at max-w-[36rem] through the
640-1023px band (only widening to 75rem once the lg: 2-column split
kicks in), so it reads as a compact modal at every width, not a
near-full-bleed stack.

app/components/NewsletterModal.tsx

@@ -144,7 +144,17 @@ export function NewsletterModal({ open, onClose }: { open: boolean; onClose: ()
             animate={{ opacity: 1, y: 0, scale: 1 }}
             exit={{ opacity: 0, y: 16, scale: 0.97 }}
             transition={{ duration: 0.3, ease: [0.22, 1, 0.36, 1] }}
-            className="relative bg-bg-base rounded-md overflow-hidden w-full max-w-[75rem] max-h-[90vh] overflow-y-auto"
+            // Capped narrower than the Desktop 75rem through the whole
+            // 640-1023px Tablet band — this dialog is a modal, not a page
+            // section, so at Tablet it should read as a compact centered
+            // card, not stretch to near-full-viewport-width once stacked
+            // single-column (see the flex-col/flex-row split below):
+            // full-bleed-width + a single stacked photo/text column made
+            // the photo huge and the text below it look lost/disconnected
+            // (reported 2026-07-29, after first trying a lg:-gated
+            // structural stack with no width cap). max-w-[75rem] only
+            // takes over once the 2-column split itself starts at lg:.
+            className="relative bg-bg-base rounded-md overflow-hidden w-full max-w-[36rem] lg:max-w-[75rem] max-h-[90vh] overflow-y-auto"
           >
         <button
           ref={closeButtonRef}
@@ -156,14 +166,17 @@ export function NewsletterModal({ open, onClose }: { open: boolean; onClose: ()
           <Image alt="" src="/icon-close.png" width={24} height={24} className="size-full object-contain" />
         </button>
 
-        {/* modal-top: photo + copy/form, stacked below sm (moved down from the old md:) */}
-        <div className="flex flex-col sm:flex-row items-stretch border-b border-border">
-          <div className="relative w-full sm:flex-1 aspect-[4/3] sm:aspect-auto">
+        {/* modal-top: photo + copy/form, stacked below lg: — paired with
+            the dialog's own narrower max-w-[36rem] cap through Tablet
+            (see above), so the stacked photo stays a reasonably-sized
+            4:3 banner instead of blowing up to near-full-viewport-width. */}
+        <div className="flex flex-col lg:flex-row items-stretch border-b border-border">
+          <div className="relative w-full lg:flex-1 aspect-[4/3] lg:aspect-auto">
             <Image
               src="/newsletter-modal-photo.jpg"
               alt="Notizbuch mit Kaffee und Stift"
               fill
-              sizes="(min-width: 640px) 50vw, 100vw"
+              sizes="(min-width: 1024px) 50vw, 36rem"
               className="object-cover"
             />
           </div>
@@ -172,8 +185,8 @@ export function NewsletterModal({ open, onClose }: { open: boolean; onClose: ()
             {/* -scale-y-100 is required, not just -rotate-4 — the SVG
                 itself is authored upside-down (matches how Newsletter.tsx
                 uses this exact same asset); without it the icon renders
-                flipped. Hidden below sm: — removed on mobile 2026-07-24. */}
-            <div className="hidden sm:block w-16 h-14 -rotate-4 -scale-y-100">
+                flipped. Hidden below lg: — removed on mobile 2026-07-24. */}
+            <div className="hidden lg:block w-16 h-14 -rotate-4 -scale-y-100">
               <Image alt="" src="/newsletter-icon.svg" width={64} height={56} className="w-full h-full" />
             </div>
 
@@ -263,7 +276,9 @@ export function NewsletterModal({ open, onClose }: { open: boolean; onClose: ()
             items-start + a fixed icon bounding box (icons have different
             native proportions, e.g. the sparkle glyph isn't square) fixes
             it without needing the flip trick. */}
-        <div className="flex flex-col sm:flex-row items-start px-8 md:px-20 py-6 md:py-9 gap-8 sm:gap-6">
+        {/* Same lg: exception as modal-top above, for the same narrower-
+            dialog-width-through-Tablet reason. */}
+        <div className="flex flex-col lg:flex-row items-start px-8 md:px-20 py-6 md:py-9 gap-8 lg:gap-6">
           {features.map((f) => (
             <div key={f.title} className="flex-1 flex gap-6 items-start w-full">
               <div className="relative h-10 w-10 shrink-0 flex items-center justify-center">