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/atoms/AnnotationBadge/AnnotationBadge.tsx

@@ -0,0 +1,27 @@
+import { Badge } from '@mantine/core'
+
+export type AnnotationVariant = 'audience' | 'readOnly' | 'destructive' | 'longRun' | 'priority' | 'default'
+
+export interface AnnotationBadgeProps {
+  label: string
+  variant?: AnnotationVariant
+}
+
+const variantMap: Record<AnnotationVariant, { color: string; variant: string }> = {
+  audience: { color: 'gray', variant: 'outline' },
+  readOnly: { color: 'dark', variant: 'filled' },
+  destructive: { color: 'red', variant: 'outline' },
+  longRun: { color: 'yellow', variant: 'outline' },
+  priority: { color: 'orange', variant: 'light' },
+  default: { color: 'gray', variant: 'light' },
+}
+
+export function AnnotationBadge({ label, variant = 'default' }: AnnotationBadgeProps) {
+  const { color, variant: badgeVariant } = variantMap[variant]
+
+  return (
+    <Badge color={color} variant={badgeVariant}>
+      {label}
+    </Badge>
+  )
+}