style(prompt-field): trim scroll-paging comments to standalone one-liners

Author: rubencarvalho

2nd-gen/packages/swc/patterns/conversational-ai/prompt-field/PromptField.ts

@@ -702,10 +702,7 @@ export class PromptField extends SpectrumElement {
       return;
     }
 
-    // Scroll to the tile that starts the next/previous page rather than a
-    // blind clientWidth: near the end only one item may remain, and a full
-    // page-width would overshoot and then snap back. scrollIntoView lands on
-    // the tile's snap point directly and clamps to the content edge.
+    // Scroll the page-start tile into view: snap-aligned, clamps at the edge.
     const scrollRect = scrollEl.getBoundingClientRect();
     const pageStart = this._isRtl()
       ? scrollRect.right - direction * scrollEl.clientWidth

2nd-gen/packages/swc/patterns/conversational-ai/prompt-field/prompt-field.css

@@ -217,10 +217,7 @@
   overflow-y: hidden;
   scroll-behavior: smooth;
 
-  /* proximity, not mandatory: the has-scroll-prev/next classes change
-   * scroll-padding-inline when a chevron appears, and mandatory would force an
-   * instant re-snap to the new alignment (a visible yank). Paging still lands
-   * aligned because it scrollIntoViews the target tile. */
+  /* proximity avoids a forced re-snap when the chevrons change scroll-padding */
   scroll-snap-type: inline proximity;
   scroll-padding-inline: token("spacing-75");
   scrollbar-color: token("gray-400") transparent;

2nd-gen/packages/swc/patterns/conversational-ai/prompt-field/test/prompt-field.test.ts

@@ -348,8 +348,7 @@ export const ArtifactScrollPaginationTest: Story = {
         const tiles = scrollEl
           ?.querySelector('slot')
           ?.assignedElements({ flatten: true }) as HTMLElement[] | undefined;
-        // proximity is the default strictness, so it is omitted from the
-        // computed value ('inline'); only mandatory would be serialized.
+        // Computed scroll-snap-type omits proximity (the default); only mandatory serializes.
         const snapType = getComputedStyle(scrollEl!).scrollSnapType;
         expect(snapType).toContain('inline');
         expect(snapType).not.toContain('mandatory');