[Release] Capture release screenshots from real app screens

[jjoonleo]

Backlog ID: ISSUE-017
Source: plans/release_app_todos.md

Goal

Produce screenshots that reflect the actual release build.

Parallelization

Status: manual

Prerequisites

• Release-like app build and device/screenshot environment are required.

Acceptance criteria

• Screenshots are captured from a release-like build.
• Screenshots cover onboarding/permission request, schedule creation, alarm/preparation flow, calendar/home, and My Page/account controls.
• Screenshot text matches shipped localization.
• Screenshot dimensions meet current Play Console requirements.
• Screenshots avoid mock-only or unfinished states.

Codex thread guidance

• Work only on this issue's scope.
• Do not modify unrelated release issues.
• If this issue is blocked by external access or human approval, prepare the needed checklist/text and leave the issue open.
• Codex may prepare capture instructions, but final screenshots require device/build/screenshot access.