fix(i18n): mark style labels without loading the catalogs (#1421)

The style shaders and visualPresets imported msg() from src/i18n/index.js,
which loads every locale catalog. The share-view codec reads the styles'
defaults, so a server bundling the codec carried about 0.9 MB of
translations it never uses. They now import the catalog-free marker, as
other portable modules do; the codec's bundle drops from about 1 MB to
130 KB.

src/styles/anime.js

@@ -1,4 +1,4 @@
-import { msg } from '../i18n/index.js';
+import { msg } from '../i18n/marker.js';
 
 /**
  * Anime / Studio Ghibli Style — Cel-shading + Saturation boost

src/styles/noir.js

@@ -1,4 +1,4 @@
-import { msg } from '../i18n/index.js';
+import { msg } from '../i18n/marker.js';
 
 /**
  * Noir Style — Desaturation + High Contrast + Vignette

src/styles/retro.js

@@ -1,4 +1,4 @@
-import { msg } from '../i18n/index.js';
+import { msg } from '../i18n/marker.js';
 
 /**
  * CRT Terminal — Dynamic CRT Monitor Aesthetic

src/styles/snow.js

@@ -1,4 +1,4 @@
-import { msg } from '../i18n/index.js';
+import { msg } from '../i18n/marker.js';
 
 /**
  * Snow Style — White overlay + Desaturation + Falling particles

src/styles/surveillance.js

@@ -1,4 +1,4 @@
-import { msg } from '../i18n/index.js';
+import { msg } from '../i18n/marker.js';
 
 /**
  * Night Vision / NVG — PVS-14 Image Intensifier Emulation

src/styles/thermal.js

@@ -1,4 +1,4 @@
-import { msg } from '../i18n/index.js';
+import { msg } from '../i18n/marker.js';
 
 /**
  * FLIR — Forward Looking Infrared

src/ui/visualPresets.js

@@ -5,7 +5,7 @@ import { snowShader } from '../styles/snow.js';
 import { nightVisionShader } from '../styles/surveillance.js';
 import { thermalShader } from '../styles/thermal.js';
 import { BLOOM_INTENSITY_DEFAULT } from '../bloom.js';
-import { msg } from '../i18n/index.js';
+import { msg } from '../i18n/marker.js';
 
 /** Duration (ms) for shader intensity crossfade between style presets. */
 export const TRANSITION_DURATION_MS = 500;