chore: reformat after editorconfig update

Updated .editorconfig to set indent_style=space and indent_size=4 for C# files. Reformat all .cs files to apply the new indentation settings. No code logic changes, just whitespace reformatting.
also updated some comments in files in shorter and Precise way. No logic changes, just comment rewording for clarity and conciseness.

HellionChat/SelfTests/ThemeSwitchSelfTestStep.cs

@@ -4,13 +4,9 @@ using HellionChat.Themes;
 
 namespace HellionChat.SelfTests;
 
-// Validates the runtime theme-switch contract from the user side. The
-// caller toggles the active theme via Settings -> Theme & Layout, the
-// step polls ThemeRegistry.Active per frame and only passes once the
-// slug has moved away from the initial value and back. The ABGR cache
-// is sanity-checked on every frame: a freshly switched theme must carry
-// a populated cache, otherwise Switch() forgot the recompute and the UI
-// would still draw, just with all-transparent slots.
+// Validates the runtime theme-switch contract: polls ThemeRegistry.Active
+// per frame until the slug moves away and back, then sanity-checks that
+// the ABGR cache was recomputed on switch.
 internal sealed class ThemeSwitchSelfTestStep : ISelfTestStep
 {
     private readonly Plugin plugin;
@@ -73,9 +69,8 @@ internal sealed class ThemeSwitchSelfTestStep : ISelfTestStep
         this.switchedAway = false;
     }
 
-    // Any non-zero slot proves the cache was actually recomputed for the
-    // current theme. We don't compare against a reference, because custom
-    // themes can legitimately share slot values with a built-in.
+    // Any non-zero slot confirms the cache was recomputed — no reference
+    // comparison since custom themes can share slot values with built-ins.
     private static bool HasPopulatedCache(Theme theme)
     {
         var cache = theme.AbgrCache;