fix(base,icon-registry): replace unsafe Function type with explicit signatures

[iOvergaard]

Summary

• Replace Function type with () => void in Timer constructor (uui-base)
• Replace Function types with explicit (value: string) => void and (reason?: unknown) => void in UUIIconHost (uui-icon-registry)

Fixes @typescript-eslint/no-unsafe-function-type warnings.

Test plan

• TypeScript compilation passes for uui-base and uui-icon-registry
• CI passes

🤖 Generated with Claude Code

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[Copilot]

Pull request overview

This PR addresses @typescript-eslint/no-unsafe-function-type warnings by replacing broad Function types with explicit callback signatures in two exported utilities (Timer in uui-base, and UUIIconHost in uui-icon-registry).

Changes:

• Tighten UUIIconHost’s internal resolve and public reject types to explicit promise resolver/rejector signatures.
• Tighten Timer’s constructor callback type from Function to () => void.

Reviewed changes

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

File	Description
packages/uui-icon-registry/lib/UUIIconHost.ts	Replaces Function with explicit resolve/reject function signatures.
packages/uui-base/lib/utils/Timer.ts	Replaces Function with an explicit no-arg callback signature for the timer completion callback.

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[nielslyngsoe]

@iOvergaard seems like good changes, I think (this as any) could be removed then.

I dont feel super streong about the second co-pilot comment, I think its fair that we take no arguments and that it does not return anything. So okay with me to pass that comment.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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