fix: preserve Skills section in parser and improve button visibility

- Fix stripBrackets() removing Skills section header
  - Add structural header whitelist (Skills, Status, Inventory, etc.)
  - Implement smart look-ahead to detect content below labels
  - Previous logic incorrectly removed 'Skills:' when followed by category labels
- Add proper theming to category action buttons (.rpg-category-action)
  - Match styling of view toggle buttons
  - Use SmartTheme colors for better visibility
- Fix RPG attributes styling in Tracker Editor
  - Change background from --rpg-accent to --SmartThemeBlurTintColor
  - Update border to match other themed inputs

Resolves issue where skills with categories were all showing as 'Uncategorized'
due to the Skills section being truncated during parsing.

style.css

@@ -5260,8 +5260,8 @@ body:has(.rpg-panel.rpg-position-left) #sheld {
     align-items: center;
     gap: 0.5em;
     padding: 0.5em;
-    background: var(--rpg-accent);
-    border: 1px solid var(--rpg-border);
+    background: var(--SmartThemeBlurTintColor);
+    border: 2px solid var(--SmartThemeBorderColor);
     border-radius: 0.375em;
 }
 
@@ -8112,6 +8112,26 @@ body:has(.rpg-panel.rpg-position-left) #sheld {
     gap: 0.5rem;
 }
 
+.rpg-category-action {
+    padding: 0.35rem 0.6rem;
+    background: var(--SmartThemeBlurTintColor);
+    border: 2px solid var(--SmartThemeBorderColor);
+    border-radius: 0.25rem;
+    color: var(--SmartThemeFastUISliderColColor);
+    cursor: pointer;
+    transition: all 0.2s ease;
+    font-size: 0.9rem;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+.rpg-category-action:hover {
+    background: var(--SmartThemeBlurTintColor);
+    border-color: var(--rpg-highlight);
+    color: var(--rpg-highlight);
+}
+
 .rpg-category-content {
     margin-top: 0.75rem;
 }