Fix extension register tab with API (#229)

* Get rid of extension manager impl

* nit

* Test register tab

src/scripts/extensionManager.ts

@@ -1,43 +0,0 @@
-import { useWorkspaceStore } from '@/stores/workspaceStateStore'
-import { ExtensionManager, SidebarTabExtension } from '@/types/extensionTypes'
-
-export class ExtensionManagerImpl implements ExtensionManager {
-  private sidebarTabs: SidebarTabExtension[] = []
-  private workspaceStore = useWorkspaceStore()
-
-  registerSidebarTab(tab: SidebarTabExtension) {
-    this.sidebarTabs.push(tab)
-    this.updateSidebarOrder()
-  }
-
-  unregisterSidebarTab(id: string) {
-    const index = this.sidebarTabs.findIndex((tab) => tab.id === id)
-    if (index !== -1) {
-      const tab = this.sidebarTabs[index]
-      if (tab.type === 'custom' && tab.destroy) {
-        tab.destroy()
-      }
-      this.sidebarTabs.splice(index, 1)
-      this.updateSidebarOrder()
-    }
-  }
-
-  getSidebarTabs() {
-    return this.sidebarTabs.sort((a, b) => {
-      const orderA = this.workspaceStore.sidebarTabsOrder.indexOf(a.id)
-      const orderB = this.workspaceStore.sidebarTabsOrder.indexOf(b.id)
-      return orderA - orderB
-    })
-  }
-
-  private updateSidebarOrder() {
-    const currentOrder = this.workspaceStore.sidebarTabsOrder
-    const newTabs = this.sidebarTabs.filter(
-      (tab) => !currentOrder.includes(tab.id)
-    )
-    this.workspaceStore.updateSidebarOrder([
-      ...currentOrder,
-      ...newTabs.map((tab) => tab.id)
-    ])
-  }
-}