Animate InspectorView screen transitions and refactor App.tsx

- InspectorView: wrap each screen in a Mantine `Transition` (`fade-up`,
  350ms). Outgoing screens fade out and slide down 30px; incoming screens
  fade in and slide up to meet the ViewHeader. A `pos: "relative"` Stack
  container holds the screens so the absolute-positioned `Transition`
  wrappers stack in the same area without pushing layout.
- InspectorView: reorder ALL_TABS so Logs sits beside History at the end:
  Servers · Tools · Prompts · Resources · Tasks · Logs · History.
- App.tsx: refactor to AGENTS.md guidelines — extract `PageContainer`,
  `PageStack`, `ThemeToggle`, `SubtitleText` as `.withProps()`
  subcomponents; replace inline unicode glyphs with `MdLightMode` /
  `MdDarkMode` icons (matches the ViewHeader pattern); convert the click
  handler to a `function` declaration.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

clients/web/src/App.tsx

@@ -1,41 +1,59 @@
 import {
-  Title,
-  Text,
-  Container,
-  Stack,
-  useMantineColorScheme,
-  useComputedColorScheme,
   ActionIcon,
+  Container,
   Group,
+  Stack,
+  Text,
+  Title,
+  useComputedColorScheme,
+  useMantineColorScheme,
 } from "@mantine/core";
+import { MdDarkMode, MdLightMode } from "react-icons/md";
+
+const PageContainer = Container.withProps({
+  size: "sm",
+  py: "xl",
+});
+
+const PageStack = Stack.withProps({
+  align: "center",
+  gap: "md",
+});
+
+const ThemeToggle = ActionIcon.withProps({
+  variant: "default",
+  size: "lg",
+  "aria-label": "Toggle color scheme",
+});
+
+const SubtitleText = Text.withProps({
+  c: "var(--inspector-text-secondary)",
+});
 
 function App() {
   const { setColorScheme } = useMantineColorScheme();
   const computedColorScheme = useComputedColorScheme("light");
+  const isDark = computedColorScheme === "dark";
+  const ThemeIcon = isDark ? MdLightMode : MdDarkMode;
 
-  const toggleColorScheme = () => {
-    setColorScheme(computedColorScheme === "dark" ? "light" : "dark");
-  };
+  function toggleColorScheme() {
+    setColorScheme(isDark ? "light" : "dark");
+  }
 
   return (
-    <Container size="sm" py="xl">
-      <Stack align="center" gap="md">
+    <PageContainer>
+      <PageStack>
         <Group>
           <Title order={1}>MCP Inspector</Title>
-          <ActionIcon
-            onClick={toggleColorScheme}
-            variant="default"
-            size="lg"
-            aria-label="Toggle color scheme"
-          >
-            {computedColorScheme === "dark" ? "\u2600" : "\u263E"}
-          </ActionIcon>
+          <ThemeToggle onClick={toggleColorScheme}>
+            <ThemeIcon size={20} />
+          </ThemeToggle>
         </Group>
-        <Text c="var(--inspector-text-secondary)">
+        <SubtitleText>
           Web client for the Model Context Protocol Inspector
-        </Text>
-      </Stack>
-    </Container>
+        </SubtitleText>
+      </PageStack>
+    </PageContainer>
   );
 }
 

clients/web/src/components/views/InspectorView/InspectorView.tsx

@@ -1,5 +1,5 @@
-import { useMemo, useState } from "react";
-import { AppShell } from "@mantine/core";
+import { useMemo, useState, type ReactNode } from "react";
+import { AppShell, Box, Stack, Transition } from "@mantine/core";
 import type {
   InitializeResult,
   LoggingLevel,
@@ -35,11 +35,45 @@ const ALL_TABS: string[] = [
   "Tools",
   "Prompts",
   "Resources",
-  "Logs",
   "Tasks",
+  "Logs",
   "History",
 ];
 
+const SCREEN_TRANSITION_MS = 350;
+
+const ScreenStageContainer = Stack.withProps({
+  pos: "relative",
+  gap: 0,
+  flex: 1,
+  mih: "100%",
+});
+
+function ScreenStage({
+  active,
+  children,
+}: {
+  active: boolean;
+  children: ReactNode;
+}) {
+  return (
+    <Transition
+      mounted={active}
+      transition="fade-up"
+      duration={SCREEN_TRANSITION_MS}
+      timingFunction="ease"
+    >
+      {(styles) => (
+        // `style={styles}` is the runtime transition state from Mantine's
+        // Transition API — these are interpolated values, not static styling.
+        <Box style={styles} pos="absolute" top={0} left={0} right={0}>
+          {children}
+        </Box>
+      )}
+    </Transition>
+  );
+}
+
 // Demo stub: every screen-action callback below resolves to noop. Phase 3
 // wiring will replace each with its real `useManaged*` / `useConnection`
 // hook call. Anything still pointing here in Phase 3 is unfinished.
@@ -204,84 +238,86 @@ export function InspectorView({
         )}
       </AppShell.Header>
       <AppShell.Main>
-        {activeTab === SERVERS_TAB && (
-          <ServerListScreen
-            servers={servers}
-            activeServer={activeServer}
-            onAddManually={noop}
-            onImportConfig={noop}
-            onImportServerJson={noop}
-            onToggleConnection={handleToggleConnection}
-            onServerInfo={noop}
-            onSettings={noop}
-            onEdit={noop}
-            onClone={noop}
-            onRemove={noop}
-          />
-        )}
-        {activeTab === "Tools" && (
-          <ToolsScreen
-            tools={tools}
-            listChanged={false}
-            onRefreshList={noop}
-            onSelectTool={noop}
-            onCallTool={noop}
-          />
-        )}
-        {activeTab === "Prompts" && (
-          <PromptsScreen
-            prompts={prompts}
-            listChanged={false}
-            onRefreshList={noop}
-            onSelectPrompt={noop}
-            onGetPrompt={noop}
-          />
-        )}
-        {activeTab === "Resources" && (
-          <ResourcesScreen
-            resources={resources}
-            templates={resourceTemplates}
-            subscriptions={subscriptions}
-            listChanged={false}
-            onRefreshList={noop}
-            onSelectUri={noop}
-            onSelectTemplate={noop}
-            onReadResource={noop}
-            onSubscribeResource={noop}
-            onUnsubscribeResource={noop}
-          />
-        )}
-        {activeTab === "Logs" && (
-          <LoggingScreen
-            entries={logs}
-            currentLevel={logLevel}
-            onSetLevel={setLogLevel}
-            onClear={noop}
-            onExport={noop}
-            autoScroll={autoScroll}
-            onToggleAutoScroll={() => setAutoScroll((prev) => !prev)}
-            onCopyAll={noop}
-          />
-        )}
-        {activeTab === "Tasks" && (
-          <TasksScreen
-            tasks={tasks}
-            progressByTaskId={progressByTaskId}
-            onRefresh={noop}
-            onClearCompleted={noop}
-            onCancel={noop}
-          />
-        )}
-        {activeTab === "History" && (
-          <HistoryScreen
-            entries={history}
-            pinnedIds={new Set()}
-            onClearAll={noop}
-            onExport={noop}
-            onReplay={noop}
-            onTogglePin={noop}
-          />
-        )}
+        <ScreenStageContainer>
+          <ScreenStage active={activeTab === SERVERS_TAB}>
+            <ServerListScreen
+              servers={servers}
+              activeServer={activeServer}
+              onAddManually={noop}
+              onImportConfig={noop}
+              onImportServerJson={noop}
+              onToggleConnection={handleToggleConnection}
+              onServerInfo={noop}
+              onSettings={noop}
+              onEdit={noop}
+              onClone={noop}
+              onRemove={noop}
+            />
+          </ScreenStage>
+          <ScreenStage active={activeTab === "Tools"}>
+            <ToolsScreen
+              tools={tools}
+              listChanged={false}
+              onRefreshList={noop}
+              onSelectTool={noop}
+              onCallTool={noop}
+            />
+          </ScreenStage>
+          <ScreenStage active={activeTab === "Prompts"}>
+            <PromptsScreen
+              prompts={prompts}
+              listChanged={false}
+              onRefreshList={noop}
+              onSelectPrompt={noop}
+              onGetPrompt={noop}
+            />
+          </ScreenStage>
+          <ScreenStage active={activeTab === "Resources"}>
+            <ResourcesScreen
+              resources={resources}
+              templates={resourceTemplates}
+              subscriptions={subscriptions}
+              listChanged={false}
+              onRefreshList={noop}
+              onSelectUri={noop}
+              onSelectTemplate={noop}
+              onReadResource={noop}
+              onSubscribeResource={noop}
+              onUnsubscribeResource={noop}
+            />
+          </ScreenStage>
+          <ScreenStage active={activeTab === "Tasks"}>
+            <TasksScreen
+              tasks={tasks}
+              progressByTaskId={progressByTaskId}
+              onRefresh={noop}
+              onClearCompleted={noop}
+              onCancel={noop}
+            />
+          </ScreenStage>
+          <ScreenStage active={activeTab === "Logs"}>
+            <LoggingScreen
+              entries={logs}
+              currentLevel={logLevel}
+              onSetLevel={setLogLevel}
+              onClear={noop}
+              onExport={noop}
+              autoScroll={autoScroll}
+              onToggleAutoScroll={() => setAutoScroll((prev) => !prev)}
+              onCopyAll={noop}
+            />
+          </ScreenStage>
+          <ScreenStage active={activeTab === "History"}>
+            <HistoryScreen
+              entries={history}
+              pinnedIds={new Set()}
+              onClearAll={noop}
+              onExport={noop}
+              onReplay={noop}
+              onTogglePin={noop}
+            />
+          </ScreenStage>
+        </ScreenStageContainer>
       </AppShell.Main>
     </AppShell>
   );