fix: open file content in new window when clicking file name in FileItemModal (#24125)

Previously, clicking the file name link did not open the file content
because the condition checked `!isPDF && item.url`, which failed for
`type === 'file'` items that use an ID-based URL path.

Update the condition to trigger on `item.type === 'file' || item.url`,
and resolve the correct URL by extracting `fileId` from `item.id` or
`item.tempId` instead of using `item.url` directly as the file
identifier.

src/lib/components/common/FileItemModal.svelte

@@ -266,12 +266,13 @@
 							href="#"
 							class="hover:underline line-clamp-1"
 							on:click|preventDefault={() => {
-								if (!isPDF && item.url) {
+								if (item.type === 'file' || item.url) {
+									let fileId = item?.id ?? item?.tempId;
 									window.open(
 										item.type === 'file'
 											? item?.url?.startsWith('http')
 												? item.url
-												: `${WEBUI_API_BASE_URL}/files/${item.url}/content`
+												: `${WEBUI_API_BASE_URL}/files/${fileId}/content`
 											: item.url,
 										'_blank'
 									);