fix: give docx and pptx previews in the file modal a definite frame height (#28878)

src/lib/components/common/FileItemModal.svelte

@@ -569,7 +569,7 @@
 						{#if docxError}
 							<div class="text-red-500 text-sm p-4">{docxError}</div>
 						{:else if docxData}
-							<DocxPreview data={docxData} className="max-h-[60vh]" />
+							<DocxPreview data={docxData} className="h-[60vh]" />
 						{:else}
 							<div class="text-gray-500 text-sm p-4">No content available</div>
 						{/if}

src/lib/components/common/PptxPreview.svelte

@@ -215,7 +215,7 @@
 	bind:this={rootEl}
 	class="relative grid {hideThumbs
 		? 'grid-cols-[minmax(0,1fr)]'
-		: 'grid-cols-[144px_minmax(0,1fr)]'} h-full min-h-0 bg-transparent text-gray-900 dark:text-gray-100 {className}"
+		: 'grid-cols-[144px_minmax(0,1fr)]'} min-h-0 bg-transparent text-gray-900 dark:text-gray-100 {className}"
 >
 	<aside
 		class={hideThumbs