style(biome): update formatter rules to specify indent width

tarnishablec · tarnishablec · commit 8b73873c449c · 2026-01-03T13:52:23.000+08:00
diff --git a/biome.json b/biome.json
@@ -10,7 +10,8 @@
     },
     "formatter": {
         "enabled": true,
-        "indentStyle": "space"
+        "indentStyle": "space",
+        "indentWidth": 4
     },
     "linter": {
         "enabled": true,
