feat: add optional boot splash settings

[nathanhuh]

Summary

• Add a smooth retro boot splash that appears once per new app version by default.
• Store boot splash preference and last-seen version in config.
• Add a Settings screen opened with S for app-level preferences.
• Keep context picker focused on context workflows.

Related Issues

Closes #222

Validation

• make test
• make build

Checklist

• Scope is focused
• Branch name follows docs/branch-naming-harness.md
• Documentation harness reviewed (docs/documentation-harness.md)
• README updated if user-facing behavior changed
• Relevant docs/ pages updated if architecture, auth, config, or workflow changed
• Tests/validation included
• Breaking changes documented

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ℹ️ Review info

⚙️ Run configuration

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Run ID: 06439904-2ab8-4cd4-96be-1dc8b001ae0f

📥 Commits

Reviewing files that changed from the base of the PR and between 321ab19 and 2268eb7.

📒 Files selected for processing (11)

• README.md
• internal/app/app.go
• internal/app/app_test.go
• internal/app/help.go
• internal/app/messages.go
• internal/app/screen_bootup.go
• internal/app/screen_context.go
• internal/app/screen_settings.go
• internal/app/service_list.go
• internal/config/config.go
• internal/config/config_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/222-bootup-splash

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[amazon-q-developer]

This PR successfully adds a configurable retro bootup splash screen feature with proper settings integration. The implementation is clean and well-structured:

• Bootup animation renders correctly with frame-based progression
• Settings screen allows toggling the splash on/off
• Config persistence works properly with YAML marshaling
• State management flows correctly through the TUI lifecycle
• Error handling is appropriate throughout

No blocking defects found. The code is ready to merge.

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