Simplify timeline fork display: remove badge, tighten arrows

Remove the fork count badge from timeline markers and the wrapper div.
Reduce arrow button height and remove extra spacing so the up arrow
sits flush against the marker.

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

js/snapshot_manager.js

@@ -2065,7 +2065,6 @@ const CSS = `
     flex-direction: column;
     align-items: center;
     flex-shrink: 0;
-    gap: 0;
 }
 .snap-timeline-branch-btn {
     background: none;
@@ -2074,12 +2073,13 @@ const CSS = `
     font-size: 8px;
     cursor: pointer;
     padding: 0;
+    margin: 0;
     line-height: 1;
     display: flex;
     align-items: center;
     justify-content: center;
     width: 18px;
-    height: 10px;
+    height: 8px;
     border-radius: 2px;
     flex-shrink: 0;
     opacity: 0.7;
@@ -2089,29 +2089,6 @@ const CSS = `
     opacity: 1;
     background: rgba(59, 130, 246, 0.2);
 }
-.snap-timeline-fork-marker-wrap {
-    position: relative;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-}
-.snap-timeline-fork-badge {
-    position: absolute;
-    top: -4px;
-    right: -6px;
-    font-size: 7px;
-    font-weight: 700;
-    color: #fff;
-    background: #3b82f6;
-    border-radius: 6px;
-    min-width: 12px;
-    height: 12px;
-    display: flex;
-    align-items: center;
-    justify-content: center;
-    line-height: 1;
-    pointer-events: none;
-}
 .snap-diff-overlay {
     position: fixed;
     inset: 0;
@@ -3538,17 +3515,8 @@ function buildTimeline() {
                     if (sidebarRefresh) sidebarRefresh().catch(() => {});
                 });
 
-                // Marker with fork count badge
-                const markerWrap = document.createElement("div");
-                markerWrap.className = "snap-timeline-fork-marker-wrap";
-                const badge = document.createElement("span");
-                badge.className = "snap-timeline-fork-badge";
-                badge.textContent = `${children.length}`;
-                markerWrap.appendChild(marker);
-                markerWrap.appendChild(badge);
-
                 group.appendChild(upBtn);
-                group.appendChild(markerWrap);
+                group.appendChild(marker);
                 group.appendChild(downBtn);
                 track.appendChild(group);
             } else {