feat(anchor-tabs): use home icon for bind marker and menu entry

- Always use the "home" icon for the corner marker; distinguish the
  navigated-away state with the accent colour instead of swapping to the
  "undo" icon.
- Use the "home" icon for the Bind URL context-menu entry as well (it
  previously showed "undo" in the unbound state).

Author: VictorVow

src/services/menu.fg.options.tabs.ts

@@ -266,7 +266,7 @@ export const tabsMenuOptions: Record<string, () => MenuOption | MenuOption[] | u
     if (!firstTab) return
     return {
       label: translate('menu.tab.' + (firstTab.anchorUrl ? 'unanchor' : 'anchor')),
-      icon: firstTab.anchorUrl ? 'icon_home' : 'icon_undo',
+      icon: 'icon_home',
       onClick: firstTab.anchorUrl
         ? () => Tabs.unanchorTabs(selected)
         : () => Tabs.anchorTabs(selected),

src/sidebar/components/tab.vue

@@ -50,7 +50,7 @@
       svg.progress-spinner(v-else): use(href="#icon_hourglass")
       .child-count(v-if="tab.reactive.folded && tab.reactive.branchLen") {{tab.reactive.branchLen}}
       .bind-mark(v-if="tab.reactive.anchored")
-        svg.bind-mark-icon: use(:href="tab.reactive.anchoredAway ? '#icon_undo' : '#icon_home'")
+        svg.bind-mark-icon: use(href="#icon_home")
     .audio(
       v-if="tab.reactive.mediaAudible || tab.reactive.mediaMuted || tab.reactive.mediaPaused"
       @mousedown.stop.prevent="onAudioMouseDown($event, tab)"

src/styles/sidebar/tab.styl

@@ -712,6 +712,10 @@
 .Tab[data-active="true"] .bind-mark-icon
   fill: var(--tabs-activated-fg)
 
+// Navigated away from the bound URL — highlight the marker with the accent
+.Tab[data-anchored-away="true"] .bind-mark-icon
+  fill: var(--accent)
+
 // ---
 // -- Keyframes
 // -