Add prediction market scenes and side menu entry

Prediction Markets in the side menu opens a new list scene: category
tabs (sports, crypto, macro, politics) and market cards comparing each
venue's best ask, with the best-priced venue highlighted. Tapping a
market opens a details scene showing per-venue bid/ask, the merged
order book's top levels, and per-venue market metadata with links out.
Scenes show a labeled sample dataset when no API key is configured.

Author: j0ntz

src/__tests__/scenes/PredictionMarketDetailsScene.test.tsx

@@ -0,0 +1,25 @@
+import { describe, expect, it } from '@jest/globals'
+import { render } from '@testing-library/react-native'
+import * as React from 'react'
+
+import { PredictionMarketDetailsScene } from '../../components/scenes/PredictionMarketDetailsScene'
+import { predictionMarketSampleData } from '../../plugins/prediction-markets/slipstreamSampleData'
+import { FakeProviders } from '../../util/fake/FakeProviders'
+import { fakeEdgeAppSceneProps } from '../../util/fake/fakeSceneProps'
+
+describe('PredictionMarketDetailsScene', () => {
+  it('should render', () => {
+    const rendered = render(
+      <FakeProviders>
+        <PredictionMarketDetailsScene
+          {...fakeEdgeAppSceneProps('predictionMarketDetails', {
+            market: predictionMarketSampleData.sports[0]
+          })}
+        />
+      </FakeProviders>
+    )
+
+    expect(rendered.toJSON()).toMatchSnapshot()
+    rendered.unmount()
+  })
+})

src/__tests__/scenes/PredictionMarketListScene.test.tsx

@@ -0,0 +1,22 @@
+import { describe, expect, it } from '@jest/globals'
+import { render } from '@testing-library/react-native'
+import * as React from 'react'
+
+import { PredictionMarketListScene } from '../../components/scenes/PredictionMarketListScene'
+import { FakeProviders } from '../../util/fake/FakeProviders'
+import { fakeEdgeAppSceneProps } from '../../util/fake/fakeSceneProps'
+
+describe('PredictionMarketListScene', () => {
+  it('should render', () => {
+    const rendered = render(
+      <FakeProviders>
+        <PredictionMarketListScene
+          {...fakeEdgeAppSceneProps('predictionMarkets', undefined)}
+        />
+      </FakeProviders>
+    )
+
+    expect(rendered.toJSON()).toMatchSnapshot()
+    rendered.unmount()
+  })
+})