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/ConnectionToggle/ConnectionToggle.stories.tsx

@@ -0,0 +1,46 @@
+import type { Meta, StoryObj } from '@storybook/react-vite';
+import { fn } from 'storybook/test';
+import { ConnectionToggle } from './ConnectionToggle';
+
+const meta: Meta<typeof ConnectionToggle> = {
+  title: 'Atoms/ConnectionToggle',
+  component: ConnectionToggle,
+  args: {
+    onChange: fn(),
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof ConnectionToggle>;
+
+export const Connected: Story = {
+  args: {
+    checked: true,
+    loading: false,
+    disabled: false,
+  },
+};
+
+export const Disconnected: Story = {
+  args: {
+    checked: false,
+    loading: false,
+    disabled: false,
+  },
+};
+
+export const Loading: Story = {
+  args: {
+    checked: false,
+    loading: true,
+    disabled: false,
+  },
+};
+
+export const Disabled: Story = {
+  args: {
+    checked: false,
+    loading: false,
+    disabled: true,
+  },
+};