Limit log-line highlight to start line only (not entire range)

Range extent is already shown in the annotation bar stripe — highlighting
thousands of mid-range lines in the log viewer is visually overwhelming.
Now: prominent marker only at the annotation's start line (lineNumber);
full-range tint only when the annotation is active (clicked).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ozgesolidkey

src/renderer/renderer.ts

@@ -2499,16 +2499,15 @@ function renderVisibleLines(): void {
         }
         if (matchAnn) {
           const isActive = matchAnn.id === activeAnnotationId;
-          const colors = getAnnColor(matchAnn.severity);
           const isStart = lineNum === matchAnn.lineNumber;
-          // Active: colored bg + thick border. Inactive: thin gutter line only (non-intrusive)
-          const bg = isActive ? colors.active : (isStart ? colors.stripe : 'transparent');
-          const borderW = isActive || isStart ? 3 : 2;
-          const borderOpacity = isActive ? 1 : isStart ? 0.8 : 0.3;
-          const baseColor = colors.tick.replace(/[\d.]+\)$/, `${borderOpacity})`);
-          const hl = document.createElement('div');
-          hl.style.cssText = `position:absolute;left:0;right:0;top:${top}px;height:${getLineHeight()}px;background:${bg};border-left:${borderW}px solid ${baseColor};pointer-events:none;z-index:1;`;
-          fragment.appendChild(hl);
+          // Only render a gutter indicator on the START line (or all range lines when active)
+          if (isStart || isActive) {
+            const colors = getAnnColor(matchAnn.severity);
+            const bg = isActive ? colors.active : colors.stripe;
+            const hl = document.createElement('div');
+            hl.style.cssText = `position:absolute;left:0;right:0;top:${top}px;height:${getLineHeight()}px;background:${bg};border-left:3px solid ${colors.tick};pointer-events:none;z-index:1;`;
+            fragment.appendChild(hl);
+          }
         }
       }