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/ProgressDisplay/ProgressDisplay.stories.tsx

@@ -0,0 +1,39 @@
+import type { Meta, StoryObj } from '@storybook/react-vite';
+import { ProgressDisplay } from './ProgressDisplay';
+
+const meta: Meta<typeof ProgressDisplay> = {
+  title: 'Atoms/ProgressDisplay',
+  component: ProgressDisplay,
+};
+
+export default meta;
+type Story = StoryObj<typeof ProgressDisplay>;
+
+export const ZeroPercent: Story = {
+  args: {
+    progress: 0,
+  },
+};
+
+export const HalfComplete: Story = {
+  args: {
+    progress: 50,
+    description: 'Processing...',
+  },
+};
+
+export const NearComplete: Story = {
+  args: {
+    progress: 95,
+    description: 'Almost done',
+    elapsed: '1m 30s',
+  },
+};
+
+export const Complete: Story = {
+  args: {
+    progress: 100,
+    description: 'Done',
+    elapsed: '2m 15s',
+  },
+};