Fix import shadowing and unchecked type assertions in test

[lucacome]

Proposed changes

Removes shadowing of imports and adds type assertion checks in tests. A separate PR will fix type assertions in code.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• [ ] I have read the CONTRIBUTING doc
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked that all unit tests pass after adding my changes
• [ ] I have updated necessary documentation
• [ ] I have rebased my branch onto main
• [ ] I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes, please add a brief note that summarizes the change.

NONE

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 79.48718% with 8 lines in your changes missing coverage. Please review.

Project coverage is 89.29%. Comparing base (a2aa4d3) to head (79fc769). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/framework/helpers/helpers.go	25.00%	2 Missing and 1 partial :warning:
internal/mode/static/manager.go	0.00%	3 Missing :warning:
internal/mode/static/handler.go	90.00%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2574 +/- ## ======================================= Coverage 89.29% 89.29% ======================================= Files 100 100 Lines 7633 7633 Branches 50 50 ======================================= Hits 6816 6816 Misses 761 761 Partials 56 56 ```

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