UPSTREAM PR #17555: Fix unreadable user markdown colors and truncate long texts in deletion dialogs

tools/server/webui/src/lib/components/app/chat/ChatAttachments/ChatAttachmentThumbnailFile.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 	import { RemoveButton } from '$lib/components/app';
-	import { getFileTypeLabel, getPreviewText, formatFileSize, isTextFile } from '$lib/utils';
+	import { formatFileSize, getFileTypeLabel, getPreviewText, isTextFile } from '$lib/utils';
 	import { AttachmentType } from '$lib/enums';
 
 	interface Props {

tools/server/webui/src/lib/components/app/chat/ChatSidebar/ChatSidebar.svelte

@@ -9,6 +9,7 @@
 	import Input from '$lib/components/ui/input/input.svelte';
 	import { conversationsStore, conversations } from '$lib/stores/conversations.svelte';
 	import { chatStore } from '$lib/stores/chat.svelte';
+	import { getPreviewText } from '$lib/utils/text';
 	import ChatSidebarActions from './ChatSidebarActions.svelte';
 
 	const sidebar = Sidebar.useSidebar();
@@ -20,6 +21,9 @@
 	let showEditDialog = $state(false);
 	let selectedConversation = $state<DatabaseConversation | null>(null);
 	let editedName = $state('');
+	let selectedConversationNamePreview = $derived.by(() =>
+		selectedConversation ? getPreviewText(selectedConversation.name) : ''
+	);
 
 	let filteredConversations = $derived.by(() => {
 		if (searchQuery.trim().length > 0) {
@@ -162,7 +166,7 @@
 	bind:open={showDeleteDialog}
 	title="Delete Conversation"
 	description={selectedConversation
-		? `Are you sure you want to delete "${selectedConversation.name}"? This action cannot be undone and will permanently remove all messages in this conversation.`
+		? `Are you sure you want to delete "${selectedConversationNamePreview}"? This action cannot be undone and will permanently remove all messages in this conversation.`
 		: ''}
 	confirmText="Delete"
 	cancelText="Cancel"

tools/server/webui/src/lib/components/app/misc/MarkdownContent.svelte

@@ -504,6 +504,14 @@
 		background: hsl(var(--muted) / 0.1);
 	}
 
+	/* User message markdown should keep table borders visible on light primary backgrounds */
+	div.markdown-user-content :global(table),
+	div.markdown-user-content :global(th),
+	div.markdown-user-content :global(td),
+	div.markdown-user-content :global(.table-wrapper) {
+		border-color: currentColor;
+	}
+
 	/* Horizontal rules */
 	div :global(hr) {
 		border: none;
@@ -642,6 +650,21 @@
 		background: var(--muted);
 	}
 
+	/* Disable hover effects when rendering user messages */
+	.markdown-user-content :global(a),
+	.markdown-user-content :global(a:hover) {
+		color: var(--primary-foreground);
+	}
+
+	.markdown-user-content :global(table:hover) {
+		box-shadow: none;
+	}
+
+	.markdown-user-content :global(th:hover),
+	.markdown-user-content :global(td:hover) {
+		background: inherit;
+	}
+
 	/* Enhanced blockquotes */
 	div :global(blockquote) {
 		transition: all 0.2s ease;

tools/server/webui/src/lib/utils/file-preview.ts

@@ -34,12 +34,3 @@ export function getFileTypeLabel(input: string | undefined): string {
 	// Handle AttachmentType or other plain strings
 	return input.toUpperCase();
 }
-
-/**
- * Truncates text content for preview display
- * @param content - The text content to truncate
- * @returns Truncated content with ellipsis if needed
- */
-export function getPreviewText(content: string): string {
-	return content.length > 150 ? content.substring(0, 150) + '...' : content;
-}

tools/server/webui/src/lib/utils/index.ts

@@ -43,7 +43,8 @@ export { createMessageCountMap, getMessageCount } from './conversation-utils';
 export { copyToClipboard, copyCodeToClipboard } from './copy';
 
 // File preview utilities
-export { getFileTypeLabel, getPreviewText } from './file-preview';
+export { getFileTypeLabel } from './file-preview';
+export { getPreviewText } from './text';
 
 // File type utilities
 export {

tools/server/webui/src/lib/utils/text.ts

@@ -0,0 +1,7 @@
+/**
+ * Returns a shortened preview of the provided content capped at the given length.
+ * Appends an ellipsis when the content exceeds the maximum.
+ */
+export function getPreviewText(content: string, max = 150): string {
+	return content.length > max ? content.slice(0, max) + '...' : content;
+}