fix: browser_tests Phase 3 - type annotations and final fixes

- Add 'this: ExpectMatcherState' to ComfyPage.ts makeMatcher function
- Add type annotations to parameters (slot, comfyPage, w, inputs)
- Add 'as any' for ExtensionManager dynamic properties (workflow, focusMode, colorPalette, queueSettings)
- Fix keybindings import paths to use '/types' suffix
- Cast Subgraph types and CanvasPointerEvent in SubgraphHelper
- Fix test setting IDs with 'as any' in useSettingSearch, extensionAPI specs
- Fix AppReadiness, colorPalette, featureFlags type issues
- Replace removed ComfyPage properties with DefaultGraphPositions
- Remove unused _canvas parameter from ClipboardHelper
- Add non-null assertions for app, vaeInput, convertedInput

Reduces browser_tests typecheck errors from 72 to 0.

Amp-Thread-ID: https://ampcode.com/threads/T-019c17a3-2482-7115-8e42-ba0bbb0c9cda
Co-authored-by: Amp <amp@ampcode.com>

browser_tests/tests/vueNodes/widgets/widgetReactivity.spec.ts

@@ -13,17 +13,20 @@ test.describe('Vue Widget Reactivity', () => {
       'css=[data-testid="node-body-4"] > .lg-node-widgets > div'
     )
     await comfyPage.page.evaluate(() => {
-      const node = window.graph!._nodes_by_id['4']
+      const graph = window.graph as { _nodes_by_id: Record<string, any> }
+      const node = graph._nodes_by_id['4']
       node.widgets.push(node.widgets[0])
     })
     await expect(loadCheckpointNode).toHaveCount(2)
     await comfyPage.page.evaluate(() => {
-      const node = window.graph!._nodes_by_id['4']
+      const graph = window.graph as { _nodes_by_id: Record<string, any> }
+      const node = graph._nodes_by_id['4']
       node.widgets[2] = node.widgets[0]
     })
     await expect(loadCheckpointNode).toHaveCount(3)
     await comfyPage.page.evaluate(() => {
-      const node = window.graph!._nodes_by_id['4']
+      const graph = window.graph as { _nodes_by_id: Record<string, any> }
+      const node = graph._nodes_by_id['4']
       node.widgets.splice(0, 0, node.widgets[0])
     })
     await expect(loadCheckpointNode).toHaveCount(4)
@@ -33,17 +36,20 @@ test.describe('Vue Widget Reactivity', () => {
       'css=[data-testid="node-body-3"] > .lg-node-widgets > div'
     )
     await comfyPage.page.evaluate(() => {
-      const node = window.graph!._nodes_by_id['3']
+      const graph = window.graph as { _nodes_by_id: Record<string, any> }
+      const node = graph._nodes_by_id['3']
       node.widgets.pop()
     })
     await expect(loadCheckpointNode).toHaveCount(5)
     await comfyPage.page.evaluate(() => {
-      const node = window.graph!._nodes_by_id['3']
+      const graph = window.graph as { _nodes_by_id: Record<string, any> }
+      const node = graph._nodes_by_id['3']
       node.widgets.length--
     })
     await expect(loadCheckpointNode).toHaveCount(4)
     await comfyPage.page.evaluate(() => {
-      const node = window.graph!._nodes_by_id['3']
+      const graph = window.graph as { _nodes_by_id: Record<string, any> }
+      const node = graph._nodes_by_id['3']
       node.widgets.splice(0, 1)
     })
     await expect(loadCheckpointNode).toHaveCount(3)