Implement an animated Aspire CLI welcome banner

[IEvangelist]

Animated Welcome Banner for Aspire CLI

Adds a --banner option that displays an animated ASCII art welcome banner with Aspire brand colors.

• Displays automatically on first CLI run (unless --nologo is set)
• Works standalone: aspire --banner
• Works additively with commands: aspire run --banner shows banner then runs
• Includes typing animation, logo reveal, version slide-in, and shine effect
• All user-facing strings are localized

Final frame is as follows:

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire-docs issue (consider using one of the following templates):
      • New (or update) doc-idea template
      • New breaking-change template
      • New diagnostic template
  • No

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 14260

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 14260"

[Copilot]

Pull request overview

This PR implements an animated ASCII art welcome banner for the Aspire CLI that displays on first run or when explicitly requested with the --banner option. The banner features the ASPIRE logo in brand colors with typing animation, logo reveal, version slide-in, and shine effects.

Changes:

• Adds IBannerService interface and BannerService implementation with animated banner rendering using Spectre.Console
• Integrates banner display into the first-time-use notice flow, showing banner on first run unless suppressed by --nologo
• Adds --banner command-line option to display the banner on demand
• Includes comprehensive test coverage for banner display logic and test infrastructure

Reviewed changes

Copilot reviewed 21 out of 22 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Aspire.Cli/Interaction/IBannerService.cs	Defines the IBannerService interface for displaying the banner
src/Aspire.Cli/Interaction/BannerService.cs	Implements animated banner with ASCII art, colors, and animation frames
src/Aspire.Cli/Commands/RootCommand.cs	Adds --banner option and handler for standalone banner display
src/Aspire.Cli/Program.cs	Integrates banner service registration and first-time-use display logic
src/Aspire.Cli/Resources/RootCommandStrings.resx	Adds localized strings for banner text (welcome message, version format)
src/Aspire.Cli/Resources/RootCommandStrings.Designer.cs	Auto-generated designer code for new resource strings
src/Aspire.Cli/Resources/xlf/*.xlf	Translation files for banner strings (marked as "new" pending localization)
tests/Aspire.Cli.Tests/TestServices/TestBannerService.cs	Test implementation of IBannerService for unit testing
tests/Aspire.Cli.Tests/Utils/CliTestHelper.cs	Updates test helper to support banner service factory injection
tests/Aspire.Cli.Tests/Commands/RootCommandTests.cs	Adds comprehensive tests for banner display behavior and first-run logic

Files not reviewed (1)

• src/Aspire.Cli/Resources/RootCommandStrings.Designer.cs: Language not supported

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[DamianEdwards]

@IEvangelist can we ensure there's a CLI E2E test that covers the scenario where this shows up (first run, etc.) so we get asciinema recordings of it?

[IEvangelist]

Hi @DamianEdwards - I added several end-to-end tests, and I did see the asciinema recordings (after manually downloading the uploaded artifacts). I attempted to manually run the Add CLI E2E Recording Comment workflow with the run id, but it didn't work. Here's the download link for the artifacts: https://github.com/dotnet/aspire/actions/runs/21547242898/artifacts/5329439867

[DamianEdwards]

@IEvangelist great, managed to download it and playback with the asciinema CLI on WSL:

aspire-cli-banner-first-run.mp4