Add new components, typography, badge contrast, and screen layout refactors

New element components:
- ListToggle: expand/collapse button using react-icons (RiExpandVerticalLine/RiCollapseVerticalLine)
- LogLevelBadge: extracted from LogEntry, handles all 8 log levels with filled variant and dark/light text contrast

New group components:
- ViewHeader: shared header bar for ConnectedView and UnconnectedView with discriminated union on `connected` prop; MCP logo links to modelcontextprotocol.io
- ServerListControls: combines ListToggle and AddServerMenu, hides toggle when no servers
- LogStreamPanel: extracted from LoggingScreen with scroll containment, filtering by visible levels and search text
- HistoryControls: vertical sidebar with search, method filter, export, and clear
- HistoryListPanel: extracted from HistoryScreen with ListToggle compact mode, filtering by method and search text

Badge contrast improvements:
- AnnotationBadge: filled variant for both dark/light modes; black text in dark, white text in light
- LogLevelBadge: same contrast approach; bold weight for alert/emergency levels
- Badge theme default weight reduced from 700 to 600

Typography:
- Added Fredoka (300-700) as body and heading font
- Added Roboto Mono as monospace font
- Google Fonts loaded in index.html and Storybook previewHead
- Heading weight set to 600

Screen layout refactors:
- LoggingScreen: owns filterText and visibleLevels state; passes to LogControls and LogStreamPanel; removed controls prop in favor of flat props
- HistoryScreen: owns searchText and methodFilter state; passes to HistoryControls and HistoryListPanel for filtering
- Both screens use new ScreenLayout (Flex variant="screen") and Sidebar subcomponents
- Added Flex theme with "screen" variant (overflow: hidden)
- Added Paper theme "panel" variant (flex column, overflow hidden)

Component enhancements:
- ServerCard: added compact prop showing only header row
- HistoryEntry: renamed isExpanded to isListExpanded; internal useState syncs via useEffect; individual entries toggle independently
- LogControls: Select All / Deselect All toggle for level checkboxes; nowrap on level selector group
- ConnectionToggle: LoadingOverlay with rounded corners for connecting state
- ConnectedView: ThemeToggle ActionIcon matched to DisconnectButton height (36px) and border color (outline variant)
- Storybook preview: fullscreen layout wrapper with 100vh overflow hidden

New stories:
- UnconnectedView: Connecting and ManyServers (12 servers for scroll testing)
- ServerCard: CompactConnected and CompactDisconnected
- All new components have corresponding stories

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

clients/web/src/components/elements/LogLevelBadge/LogLevelBadge.stories.tsx

@@ -0,0 +1,19 @@
+import type { Meta, StoryObj } from "@storybook/react-vite";
+import { LogLevelBadge } from "./LogLevelBadge";
+
+const meta: Meta<typeof LogLevelBadge> = {
+  title: "Elements/LogLevelBadge",
+  component: LogLevelBadge,
+};
+
+export default meta;
+type Story = StoryObj<typeof LogLevelBadge>;
+
+export const Debug: Story = { args: { level: "debug" } };
+export const Info: Story = { args: { level: "info" } };
+export const Notice: Story = { args: { level: "notice" } };
+export const Warning: Story = { args: { level: "warning" } };
+export const Error: Story = { args: { level: "error" } };
+export const Critical: Story = { args: { level: "critical" } };
+export const Alert: Story = { args: { level: "alert" } };
+export const Emergency: Story = { args: { level: "emergency" } };

clients/web/src/components/elements/LogLevelBadge/LogLevelBadge.tsx

@@ -0,0 +1,31 @@
+import { Badge, useComputedColorScheme } from "@mantine/core";
+import type { LogLevel } from "../LogEntry/LogEntry";
+
+export interface LogLevelBadgeProps {
+  level: LogLevel;
+}
+
+const levelColor: Record<LogLevel, string> = {
+  debug: "gray",
+  info: "blue",
+  notice: "teal",
+  warning: "yellow",
+  error: "red",
+  critical: "red",
+  alert: "red",
+  emergency: "red",
+};
+
+const boldLevels: Set<LogLevel> = new Set(["alert", "emergency"]);
+
+export function LogLevelBadge({ level }: LogLevelBadgeProps) {
+  const colorScheme = useComputedColorScheme();
+  const textColor = colorScheme === "dark" ? "black" : "white";
+  const fw = boldLevels.has(level) ? 500 : undefined;
+
+  return (
+    <Badge color={levelColor[level]} variant="filled" fw={fw} c={textColor}>
+      {level}
+    </Badge>
+  );
+}