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/useSettingSearch.spec.ts

@@ -14,14 +14,14 @@ test.describe('Settings Search functionality', { tag: '@settings' }, () => {
         name: 'TestSettingsExtension',
         settings: [
           {
-            id: 'TestHiddenSetting',
+            id: 'TestHiddenSetting' as any,
             name: 'Test Hidden Setting',
             type: 'hidden',
             defaultValue: 'hidden_value',
             category: ['Test', 'Hidden']
           },
           {
-            id: 'TestDeprecatedSetting',
+            id: 'TestDeprecatedSetting' as any,
             name: 'Test Deprecated Setting',
             type: 'text',
             defaultValue: 'deprecated_value',
@@ -29,7 +29,7 @@ test.describe('Settings Search functionality', { tag: '@settings' }, () => {
             category: ['Test', 'Deprecated']
           },
           {
-            id: 'TestVisibleSetting',
+            id: 'TestVisibleSetting' as any,
             name: 'Test Visible Setting',
             type: 'text',
             defaultValue: 'visible_value',