Add test coverage for MainActivity dual-intent Bolt opening logic

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PR #63 introduced dual-intent logic for opening Bolt (app intent → web intent) but lacked test coverage. This PR adds comprehensive tests verifying intent sequencing, timing, and error isolation.

Changes

New test file: MainActivityIntentTest.kt (308 lines)

• Intent sequence validation: Uber → Bolt app (pkg: ee.mtakso.client) → Bolt web
• Timing verification: 500ms delays between intents
• Error isolation: Uber/Bolt failures don't crash or block other intents
• Intent flags: FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_LAUNCH_ADJACENT

Test approach:

• Robolectric + ShadowActivity to capture intents from private openInSplitScreen()
• Thread.sleep() for coroutine sync (real kotlinx.coroutines.delay in production)
• Helper methods (invokeOpenInSplitScreen, collectAllIntents) reduce duplication
• Constants (MIN_DELAY_MS=400L, TEST_WAIT_MS=600L) for timing tolerance

Example test:

@Test
fun testOpenInSplitScreen_correctIntentSequence() {
    val shadowActivity = shadowOf(activity)
    invokeOpenInSplitScreen(uberDeepLink, boltDeepLink, boltDeepLinkWeb)
    val (intent1, intent2, intent3) = collectAllIntents(shadowActivity)
    
    assertEquals(Uri.parse(uberDeepLink), intent1?.data)
    assertEquals(Uri.parse(boltDeepLink), intent2?.data)
    assertEquals("ee.mtakso.client", intent2?.`package`)
    assertEquals(Uri.parse(boltDeepLinkWeb), intent3?.data)
}

Documentation:

• Updated test README with section 12 describing coverage

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