feat(frontend): default site theme to Amber instead of Classic

New visitors (no saved lv_theme) now get the Amber accent; reconciled the
static CSS accent, demo scene colors and console greeting to match so there
is no blue/emerald flash before the theme provider applies. Updated the
default-theme assertions in the theme tests.

frontend/src/features/themes/editor/tests/editor.test.tsx

@@ -36,6 +36,7 @@ test('a theme card inside the preview loads that preset into the draft, not the
   await user.click(within(gui).getByRole('option', { name: 'Тема Nitro' }))
   expect(screen.getByDisplayValue('Nitro')).toBeInTheDocument()
   expect(within(gui).getByRole('option', { name: 'Тема Nitro' })).toHaveAttribute('aria-selected', 'true')
-  expect(screen.getByRole('status', { name: 'site theme' })).toHaveTextContent(PRESETS[0].id)
+  // The site keeps its default theme (amber) even though the draft loaded Classic.
+  expect(screen.getByRole('status', { name: 'site theme' })).toHaveTextContent('amber')
   expect(window.localStorage.getItem('lv_theme')).toBeNull()
 })

frontend/src/features/themes/tests/activeTheme.test.tsx

@@ -21,7 +21,7 @@ afterEach(() => {
 
 test('a user pick persists to lv_theme, re-accents the page and locks out demo switches', () => {
   render(<ActiveThemeProvider><Probe /></ActiveThemeProvider>)
-  expect(screen.getByTestId('id')).toHaveTextContent('classic')
+  expect(screen.getByTestId('id')).toHaveTextContent('amber')
   act(() => screen.getByText('demo').click())
   expect(screen.getByTestId('id')).toHaveTextContent('sunset')
   expect(window.localStorage.getItem('lv_theme')).toBeNull()
@@ -47,7 +47,7 @@ test('restores the stored theme and survives blocked storage', () => {
     throw new Error('blocked')
   })
   render(<ActiveThemeProvider><Probe /></ActiveThemeProvider>)
-  expect(screen.getByTestId('id')).toHaveTextContent('classic')
+  expect(screen.getByTestId('id')).toHaveTextContent('amber')
   act(() => screen.getByText('user').click())
   expect(screen.getByTestId('id')).toHaveTextContent('nitro')
   vi.restoreAllMocks()

frontend/src/features/themes/useActiveTheme.ts

@@ -3,7 +3,9 @@ import { PRESETS } from './presets.generated'
 import { parseArgb, type ThemeEntry, withAlpha } from './types'
 
 const STORAGE_KEY = 'lv_theme'
-const FALLBACK = PRESETS[0]
+// Amber is the site default for visitors who never picked a theme; Classic stays at PRESETS[0]
+// (mirroring the mod's own default) and is only reached if the amber preset ever goes missing.
+const FALLBACK = PRESETS.find((p) => p.id === 'amber') ?? PRESETS[0]
 
 type ActiveTheme = {
   theme: ThemeEntry
@@ -66,7 +68,7 @@ export function ActiveThemeProvider({ children, applyToPage = true }: { children
   return createElement(ActiveThemeContext.Provider, { value }, children)
 }
 
-/** The active ClickGui theme. Outside a provider it falls back to Classic with a no-op setter. */
+/** The active ClickGui theme. Outside a provider it falls back to the default with a no-op setter. */
 export function useActiveTheme(): ActiveTheme {
   return useContext(ActiveThemeContext) ?? { theme: FALLBACK, userPicked: false, setTheme: () => {} }
 }

frontend/src/index.css

@@ -9,8 +9,9 @@
   --color-shoal: #1f3238;
   --color-frost: #9fb3b0;
   --color-snow: #eef5f3;
-  --color-ice: #34d399;
   --color-ember: #e8835a;
+  /* Matches the Amber preset (#FFE69A43) so first paint agrees with the default theme. */
+  --color-ice: #e69a43;
 
   --font-display: "Unbounded Variable", system-ui, sans-serif;
   --font-sans: "Onest Variable", system-ui, sans-serif;
@@ -29,12 +30,12 @@
 @property --color-ice {
   syntax: "<color>";
   inherits: true;
-  initial-value: #34d399;
+  initial-value: #e69a43;
 }
 @property --page-accent-glow {
   syntax: "<color>";
   inherits: true;
-  initial-value: rgb(52 211 153 / 0.35);
+  initial-value: rgb(230 154 67 / 0.35);
 }
 
 @layer base {

frontend/src/pages/app/ConfigsPage.tsx

@@ -4,7 +4,7 @@ import { VoxelScene } from '@features/landing/effects/VoxelScene'
 import { SlotGrid } from '@features/configs/components/SlotGrid'
 import { PageTitle } from '@shared/layout/PageTitle'
 
-const ACCENT = 'rgb(52, 211, 153)'
+const ACCENT = 'rgb(230, 154, 67)'
 
 export default function ConfigsPage() {
   const { t } = useTranslation('configs')

frontend/src/pages/showcase/ListingPage.tsx

@@ -3,7 +3,7 @@ import { ParticleField } from '@features/landing/effects/ParticleField'
 import { VoxelScene } from '@features/landing/effects/VoxelScene'
 import { ListingDetail } from '@features/showcase/components/ListingDetail'
 
-const ACCENT = 'rgb(52, 211, 153)'
+const ACCENT = 'rgb(230, 154, 67)'
 
 export default function ListingPage() {
   const { id } = useParams<{ id: string }>()

frontend/src/pages/showcase/ShowcasePage.tsx

@@ -4,7 +4,7 @@ import { VoxelScene } from '@features/landing/effects/VoxelScene'
 import { ListingList } from '@features/showcase/components/ListingList'
 import { PageTitle } from '@shared/layout/PageTitle'
 
-const ACCENT = 'rgb(52, 211, 153)'
+const ACCENT = 'rgb(230, 154, 67)'
 
 export default function ShowcasePage() {
   const { t } = useTranslation('showcase')

frontend/src/shared/easter/consoleGreeting.ts

@@ -2,7 +2,7 @@ import { LOGO_ART } from './art.generated'
 
 export function printConsoleGreeting(lang: string): void {
   const ru = lang.startsWith('ru')
-  console.log(`%c${LOGO_ART}`, 'color:#34d399;font-family:monospace;font-weight:bold')
+  console.log(`%c${LOGO_ART}`, 'color:#e69a43;font-family:monospace;font-weight:bold')
   console.log(
     `%c${ru ? 'Открыл DevTools? Значит, тебе тут рады.' : 'Opened DevTools? You are welcome here.'}`,
     'color:#eef5f3;font-size:13px',