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/featureFlags.spec.ts

@@ -25,7 +25,7 @@ test.describe('Feature Flags', { tag: ['@slow', '@settings'] }, () => {
       const originalSend = WebSocket.prototype.send
       WebSocket.prototype.send = function (data) {
         try {
-          const parsed = JSON.parse(data)
+          const parsed = JSON.parse(data as string)
           if (parsed.type === 'feature_flags') {
             window.__capturedMessages!.clientFeatureFlags = parsed
           }
@@ -285,10 +285,7 @@ test.describe('Feature Flags', { tag: ['@slow', '@settings'] }, () => {
           window.app?.api?.serverFeatureFlags?.supports_preview_metadata !==
           undefined
         ) {
-          window.__appReadiness = {
-            ...window.__appReadiness,
-            featureFlagsReceived: true
-          }
+          window.__appReadiness!.featureFlagsReceived = true
           clearInterval(checkFeatureFlags)
         }
       }, 10)
@@ -296,10 +293,7 @@ test.describe('Feature Flags', { tag: ['@slow', '@settings'] }, () => {
       // Monitor API initialization
       const checkApi = setInterval(() => {
         if (window.app?.api) {
-          window.__appReadiness = {
-            ...window.__appReadiness,
-            apiInitialized: true
-          }
+          window.__appReadiness!.apiInitialized = true
           clearInterval(checkApi)
         }
       }, 10)
@@ -307,10 +301,7 @@ test.describe('Feature Flags', { tag: ['@slow', '@settings'] }, () => {
       // Monitor app initialization
       const checkApp = setInterval(() => {
         if (window.app?.graph) {
-          window.__appReadiness = {
-            ...window.__appReadiness,
-            appInitialized: true
-          }
+          window.__appReadiness!.appInitialized = true
           clearInterval(checkApp)
         }
       }, 10)