Add stream creation templates to StreamCreationWizard

[ogazboiz]

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Description

The dashboard has a templates array (salary, subscription, grant) with handleApplyTemplate, but the StreamCreationWizard has no template picker. Users must fill every field from scratch for common use cases.

What Needs to Happen

• Add a template selection step at the start of the wizard
• Built-in templates: Monthly Salary, Weekly Subscription, One-time Grant, Custom
• Selecting a template pre-fills amount, duration, token, and a description tag
• User can still modify any pre-filled value
• Custom templates saved to localStorage

Files

• frontend/components/stream-creation/StreamCreationWizard.tsx
• frontend/components/stream-creation/TemplateStep.tsx (create)

Acceptance Criteria

• Template picker shown at wizard start
• Pre-fills all relevant fields on selection
• User can override any pre-filled value

[Riel101]

@Riel101 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Please assign to me

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[xeladev4]

@xeladev4 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi maintainer, I’d like to work on this issue.
I have experience building and securing Stellar/Soroban smart contracts. I focus on clean implementations.
I’ll ensure the solution follows the project’s architecture and security best practices.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @xeladev4 to this issue.

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Congratulations, @xeladev4! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @xeladev4 as part of the Stellar Wave Program's 4th Wave 🥳

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