ui: Agentic Content UX improvements (#25450)

* feat: Add shimmer text animation for processing state indicators

* feat: Redesign CollapsibleContentBlock component with improved UX

* feat: Add conditional setting display support with dependsOn field

* feat: Add showAgenticTurnStats setting for per-turn statistics

* feat: Update ChatMessageAgenticContent with improved UI and new features

* feat: Enhance file read tool UI/UX

* feat: Refine styling of collapsible content and code preview blocks

* feat: add terminal variant to CollapsibleContentBlock

* feat: add built-in tools UI registry

* feat: extract ChatMessageReasoningBlock and ChatMessageToolCallBlock

* refactor: simplify ChatMessageAgenticContent to use extracted blocks

* fix: correct markdown content block margin spacing

* fix: reorganize SettingsChatFields layout and reset button positioning

* fix: use direct map access in agentic store session methods

* refactor: remove reasoning preview/throttle system from CollapsibleContentBlock

* feat: add auto-scroll to reasoning block and remove showThoughtInProgress

* feat: add ChatMessageToolCallDateTime component and support for new tool types

* feat: improve auto-scroll reliability in reasoning block with RAF coalescing and MutationObserver

* feat: show MCP server favicon for tools without a built-in icon

* feat: add search-results parsing utilities and tests

* feat: add ChatMessageToolCallSearchResults component

* feat: integrate search results rendering into ChatMessageAgenticContent

* feat: display tool call input alongside output in ChatMessageToolCallBlock

* style: use muted foreground color in reasoning block content

* chore: Format

* feat: Refine reasoning block layout and make pending thoughts display configurable

* feat: Stream tool call code blocks with auto-scroll and handle partial JSON

* feat: add streaming permission gate infrastructure

* feat: wire permission gate into the agentic loop

* fix: bail out on abort and skip already-approved tool calls

* fix: clear partial tool calls on abort and savePartialResponse

* test: cover partial tool call cleanup end-to-end

* refactor: Remove streaming permission gate logic

* fix: Correct autoscroll and streaming gates for tool calls and reasoning blocks

* refactor: Chat Message Assistant componentization

* fix: Show health metadata for disabled MCP servers and promote connections on enable

* fix: Inherit global enabled state for missing MCP per-chat overrides

* refactor: Cleanup

* refactor: Split ChatMessageToolCallBlock into dedicated components

* feat: Add live streaming and auto-scroll for tool execution output

* feat: Add line numbers and change markers to file edit diffs

* chore: Formatting

* feat: Add type definitions and utilities for recommended MCP servers

* feat: Add recommended MCP servers configuration and storage key

* feat: Add McpServerCardCompact component for recommended servers

* feat: Add recommended servers section to Add New Server dialog

* feat: Update McpServerForm to support authorization requirements

* feat: Add select-none classes for text selection prevention

* feat: Add recommended MCP server icon assets

* refactor: Store dismissed MCP recommendations as a boolean flag

* feat: Render tool results as JSON or Markdown based on detected content type

* feat: UI improvement

* feat: Render search block early and update heading to show execution state

* fix: Prevent non-web-search tools from triggering the search UI block

* refactor: Cleanup

* refactor: Extract hardcoded icon size classes into shared constants

* refactor: Extract hardcoded tool result separator into a shared constant

* refactor: Tool Calls UI/logic

* refactor: Cleanup

* refactor: Cleanup

* refactor: Cleanup

tools/ui/src/routes/+layout.svelte

@@ -22,7 +22,7 @@
 	import { Toaster } from 'svelte-sonner';
 	import { modelsStore } from '$lib/stores/models.svelte';
 	import { mcpStore } from '$lib/stores/mcp.svelte';
-	import { TOOLTIP_DELAY_DURATION } from '$lib/constants';
+	import { AUTHORIZATION_HEADER, BEARER_PREFIX, TOOLTIP_DELAY_DURATION } from '$lib/constants';
 	import { FAVICON_PATHS, FAVICON_SELECTORS } from '$lib/constants/pwa';
 	import { useKeyboardShortcuts } from '$lib/hooks/use-keyboard-shortcuts.svelte';
 	import { usePwa } from '$lib/hooks/use-pwa.svelte';
@@ -119,7 +119,7 @@
 			) {
 				const headers: Record<string, string> = {
 					'Content-Type': 'application/json',
-					Authorization: `Bearer ${apiKey.trim()}`
+					[AUTHORIZATION_HEADER]: `${BEARER_PREFIX}${apiKey.trim()}`
 				};
 
 				fetch(`${base}/props`, { headers })
@@ -234,8 +234,12 @@
 		};
 	});
 
-	// Background MCP server health checks on app load
-	// Fetch enabled servers from settings and run health checks in background.
+	// Background MCP server health checks on app load.
+	// Health-check every configured server with a URL - including disabled ones -
+	// so the /mcp-servers page can display health metadata for servers that are
+	// currently turned off. Disabled servers never get promoted to active
+	// connections (see runHealthCheck), so their tools/prompts/resources stay
+	// out of the chat-side stores.
 	// Only IDLE servers are checked; already-resolved (SUCCESS / ERROR) servers
 	// keep their existing state, so adding or removing a server does not flash
 	// every other card back through skeleton state.
@@ -244,13 +248,12 @@
 
 		const mcpServers = mcpStore.getServers();
 
-		// Only run health checks if we have enabled servers with URLs
-		const enabledServers = mcpServers.filter((s) => s.enabled && s.url.trim());
+		const serversWithUrls = mcpServers.filter((s) => s.url.trim());
 
-		if (enabledServers.length > 0) {
+		if (serversWithUrls.length > 0) {
 			untrack(() => {
 				// Run health checks in background (don't await)
-				mcpStore.runHealthChecksForServers(enabledServers, true).catch((error) => {
+				mcpStore.runHealthChecksForServers(serversWithUrls, true).catch((error) => {
 					console.warn('[layout] MCP health checks failed:', error);
 				});
 			});