fix: browser_tests Phase 1 - mechanical fixes

- Rename dragAndDrop to dragDrop (7 occurrences)

- Add override modifiers in SidebarTab.ts (4 fixes)

- Remove .ts import extensions in actionbar.spec.ts

- Prefix unused variables with underscore (9 files)

- Fix ESLint import() type annotation in globals.d.ts

Reduces typecheck:browser errors from 229 to 215

Amp-Thread-ID: https://ampcode.com/threads/T-019c1787-c781-761d-b95a-4844e909e64c
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/fixtures/components/SidebarTab.ts

@@ -33,7 +33,7 @@ class SidebarTab {
 }
 
 export class NodeLibrarySidebarTab extends SidebarTab {
-  constructor(public readonly page: Page) {
+  constructor(public override readonly page: Page) {
     super(page, 'node-library')
   }
 
@@ -59,12 +59,12 @@ export class NodeLibrarySidebarTab extends SidebarTab {
     return this.tabContainer.locator('.new-folder-button')
   }
 
-  async open() {
+  override async open() {
     await super.open()
     await this.nodeLibraryTree.waitFor({ state: 'visible' })
   }
 
-  async close() {
+  override async close() {
     if (!this.tabButton.isVisible()) {
       return
     }
@@ -101,7 +101,7 @@ export class NodeLibrarySidebarTab extends SidebarTab {
 }
 
 export class WorkflowsSidebarTab extends SidebarTab {
-  constructor(public readonly page: Page) {
+  constructor(public override readonly page: Page) {
     super(page, 'workflows')
   }