chore(test): add stack lifecycle events screen test with scenario

[LKuchno]

Description

Adds a new single-feature test screen exercising the gamma StackContainer screen lifecycle callbacks — onWillAppear, onDidAppear, onWillDisappear, onDidDisappear — across push, pop, and a nested stack. It mirrors the existing test-tabs-lifecycle-events screen so stack and tabs lifecycle behaviour can be checked with the same toast-based visualization.

Each transition pushes a color-coded toast (onWillAppear - green, onWillDisappear - light navy, onDidAppear - light blue, onDidDisappear — dark navy) so the fired events and their order are visible on device.

Changes

• test-stack-lifecycle-events/index.tsx — test screen: an outer stack (Home → A → NestedStack) and a nested stack (NestedHome → NestedA). A shared useMakeLifecycleCallbacks hook attaches the four lifecycle callbacks to every route. The NestedStack route hides its outer header (headerConfig: { hidden: true }) so the nested stack's own header isn't doubled.
• test-stack-lifecycle-events/scenario.md — manual scenario covering push, pop via the Pop button / header back button / native back gesture / system back, and nested-stack push/pop, with per-platform expected event orderings.
• test-stack-lifecycle-events/scenario-description.ts — scenario metadata (e2eCoverage: 'tbd', platforms iOS + Android).
• stack-v5/index.ts — registers the scenario in the Stack v5 group.

[Copilot]

Pull request overview

Adds a new Stack v5 single-feature test screen to manually verify gamma StackContainer lifecycle callbacks (onWillAppear, onDidAppear, onWillDisappear, onDidDisappear) across push/pop flows, including a nested stack, using toast messages to visualize event order.

Changes:

• Introduces a new “Stack lifecycle events” scenario screen that triggers toast notifications from lifecycle callbacks for each route (outer + nested stack).
• Adds a detailed manual test scenario (scenario.md) documenting expected event sequences per platform and per navigation method.
• Registers the new scenario in the Stack v5 scenario group.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
apps/src/tests/single-feature-tests/stack-v5/test-stack-lifecycle-events/scenario.md	New manual scenario documenting expected lifecycle event ordering for push/pop and nested stack flows.
apps/src/tests/single-feature-tests/stack-v5/test-stack-lifecycle-events/scenario-description.ts	Adds scenario metadata (name/key/details/platforms/e2eCoverage).
apps/src/tests/single-feature-tests/stack-v5/test-stack-lifecycle-events/index.tsx	Implements the new test screen with outer + nested StackContainer and toast-based lifecycle callbacks.
apps/src/tests/single-feature-tests/stack-v5/index.ts	Registers and exports the new Stack v5 scenario so it appears in the scenario group/menu.

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