fix: card-overview subtext wrap + v16 default bumps + chat-colour preset

UI:
- SettingsOverview cards now wrap subtext to two lines (DrawList wrap-
  width) and the card height grew from 96 to 110 px. Single-line
  fitting clipped most of the bilingual subtitles.
- HellionStyle pushes ChildBg with alpha 0 when WindowOpacity < 1.0
  to keep stacked BeginChild layers from compounding the deckgrade
  past what the slider suggests.
- WindowOpacity slider helpmarker now points to Dalamud's per-window
  hamburger menu for opacity / blur / pin / click-through overrides.

UX defaults (v15 → v16 migration adopts new values only when the user
is still on the previous default — bool flips are heuristic, the prior
defaults are from the v1.2.0 cycle and rarely toggled):
- UseCompactDensity false → true (single-line message style is cleaner)
- HideInNewGamePlusMenu false → true (consistent with other hide-flags)
- HideSameTimestamps false → true (cleaner log)
- MaxLinesToRender 5000 → 2500 (mid-range hardware friendlier)
- ChatColours empty → Hellion brand preset (the first-run wizard does
  not offer a preset choice, so fresh installs get the brand colours
  out of the box)

HellionChat/Plugin.cs

@@ -359,6 +359,41 @@ public sealed class Plugin : IDalamudPlugin
                     });
                 }
 
+                // v1.2.1 Default-Bumps für UX-Verbesserungen. Pattern: nur
+                // migrieren wenn der User noch auf dem alten Default ist.
+                // Bei bool-Werten ist die Erkennung pragmatisch — wer den
+                // alten Default aktiv ausgeschaltet hatte, erlebt das als
+                // Regression und stellt es einmal in den Settings zurück.
+                // Der Trade-Off ist akzeptabel weil die alten Defaults in
+                // v1.2.0 erst neu eingeführt wurden und kaum jemand aktiv
+                // umgeschaltet hat.
+                if (!Config.UseCompactDensity)
+                {
+                    Config.UseCompactDensity = true;
+                    Log.Information("v16 default-bump: UseCompactDensity false → true");
+                }
+                if (!Config.HideInNewGamePlusMenu)
+                {
+                    Config.HideInNewGamePlusMenu = true;
+                    Log.Information("v16 default-bump: HideInNewGamePlusMenu false → true");
+                }
+                if (!Config.HideSameTimestamps)
+                {
+                    Config.HideSameTimestamps = true;
+                    Log.Information("v16 default-bump: HideSameTimestamps false → true");
+                }
+                if (Config.MaxLinesToRender == 5000)
+                {
+                    Config.MaxLinesToRender = 2500;
+                    Log.Information("v16 default-bump: MaxLinesToRender 5000 → 2500");
+                }
+                if (Config.ChatColours.Count == 0)
+                {
+                    foreach (var (channel, colour) in Resources.ChatColourPresets.All["Hellion"].Colours)
+                        Config.ChatColours[channel] = colour;
+                    Log.Information("v16 default-bump: ChatColours empty → Hellion brand preset");
+                }
+
                 Config.Version = 16;
                 SaveConfig();
                 Log.Information(