chore: comments, second pass -- the task codes the first pass missed

The first sweep matched a character class that swallowed the digit, so a bare
B1 slipped through while B1-2 was caught. Searching the whole A-Z space instead
of guessing prefixes turned up 130-odd more: B0 through B6, C2, C3, D1, H2, M6,
P7, P8, T2, W2, plus GP-04, KB-01, OD-1, PM-1, PM-3, SEC-01, TR-4, TR-7, UI-11,
UI-12, XC-8 and API-3.

Kept deliberately: 41 B4 01 is a byte signature, "N0" a format string,
#L119-L128 a source anchor, LS4/LS6 are linkshells, and A=FF B=0C G=41 R=C2
explains a colour-channel order. Those look like codes and are not.

Also translated the eight German comments left in the theme files and
ImGuiUtil. Seven of them described what a palette does to which channel, which
is worth reading -- just not in a second language in an otherwise English
codebase.

HellionChat/Ui/Components/InputBar.cs

@@ -64,7 +64,7 @@ internal sealed class InputBar
     private bool _wasInputTextHovered;
     private bool? _isFocusedOverride; // Test-only; null = honour per-frame Draw() value.
 
-    // UI-11 plugin-disclosure arm-and-hold: holds the buffer that armed the
+    // plugin-disclosure arm-and-hold: holds the buffer that armed the
     // disclosure warning. null = not armed. Compared by value so an edit
     // re-arms and a resend on the identical buffer goes through. 1.5.6 parity
     // (ChatInputBar 1d3b429:27).
@@ -196,7 +196,7 @@ internal sealed class InputBar
         ImGui.SameLine();
         DrawQuickButtons();
 
-        // UI-11: yellow inline warning while a plugin-only-glyph message is
+        // Yellow inline warning while a plugin-only-glyph message is
         // armed-and-held (buffer unchanged since it armed). Renders on its own
         // line below the input row. 1.5.6 parity (ChatInputBar 1d3b429:93-103).
         if (
@@ -589,7 +589,7 @@ internal sealed class InputBar
         if (string.IsNullOrEmpty(text))
             return;
 
-        // UI-11: plugin-disclosure arm-and-hold. Arm + scan on the RAW
+        // Plugin-disclosure arm-and-hold. Arm + scan on the RAW
         // _pendingMessage (NOT the trimmed `text`) so the Draw warning gate
         // (_pendingMessage == _disclosureArmedBuffer) matches byte-for-byte even
         // when the buffer has leading/trailing whitespace. 1.5.6 armed/held/