feat: Add Mantine theme, 12 atom components, and 25 molecule components with Storybook stories

- Mantine theme with component extensions (Badge, Card, Paper, Button, etc.)
- CSS custom properties for design tokens (--inspector-* vars)
- Dark/light mode support with auto detection
- 12 atoms: StatusIndicator, AnnotationBadge, CapabilityItem, LogEntry,
  ProgressDisplay, ContentViewer, ListChangedIndicator, CopyButton,
  ConnectionToggle, TransportBadge, InlineError, MessageBubble
- 25 molecules: ServerCard, AddServerMenu, SchemaForm, ToolListItem,
  ToolDetailPanel, ResultPanel, ResourceListItem, ResourcePreviewPanel,
  ResourceTemplateInput, PromptArgumentsForm, PromptMessagesDisplay,
  LogControls, TaskCard, HistoryEntry, ServerInfoContent, ServerSettingsForm,
  RootsTable, SamplingRequestPanel, ElicitationFormPanel, ElicitationUrlPanel,
  InlineSamplingRequest, InlineElicitationRequest, PendingClientRequests,
  ImportServerJsonPanel, ExperimentalFeaturesPanel
- Exclude storybook-static from version control
- Exclude .stories.tsx from app tsconfig (Storybook-only modules)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

clients/web/src/components/molecules/PromptMessagesDisplay/PromptMessagesDisplay.tsx

@@ -0,0 +1,39 @@
+import { Button, Stack, Text, Title } from '@mantine/core';
+import { MessageBubble } from '../../atoms/MessageBubble/MessageBubble';
+
+export interface PromptMessage {
+  role: string;
+  content: string;
+  imageContent?: { data: string; mimeType: string };
+  audioContent?: { data: string; mimeType: string };
+}
+
+export interface PromptMessagesDisplayProps {
+  messages: PromptMessage[];
+  onCopy: () => void;
+}
+
+export function PromptMessagesDisplay({ messages, onCopy }: PromptMessagesDisplayProps) {
+  return (
+    <Stack gap="md">
+      <Title order={4}>Messages</Title>
+      {messages.length === 0 ? (
+        <Text c="dimmed">No messages to display</Text>
+      ) : (
+        messages.map((message, index) => (
+          <MessageBubble
+            key={index}
+            index={index}
+            role={message.role as 'user' | 'assistant'}
+            content={message.content}
+            imageContent={message.imageContent}
+            audioContent={message.audioContent}
+          />
+        ))
+      )}
+      <Button variant="light" size="sm" onClick={onCopy}>
+        Copy
+      </Button>
+    </Stack>
+  );
+}