feat(panel): island, rail by day, companion mode beside a deep note, cached index and threads, obsidian skin for strips

src/view.ts

@@ -119,11 +119,17 @@ export class PanelView extends ItemView {
     const id = this.plugin.conversationIdOf(file);
     if (id) {
       this.state.selected = id;
+      this.state.companion = !this.inTabs();
     }
   }
 
   show(id: string): void {
     this.state.selected = id;
+    this.state.companion = false;
+  }
+
+  private inTabs(): boolean {
+    return this.leaf.getRoot() === this.app.workspace.rootSplit;
   }
 
   // Settings changed: the client is built from them, so rebuild the tree.