Add regression tests for is-valid/is-invalid on range inputs

[dyve]

Summary

• Range inputs correctly receive is-valid/is-invalid validation classes (Bootstrap 5 supports this)
• No test existed to guard against regressions — add two focused tests using assertIn to verify the classes are present/absent on bound valid and invalid forms

Test plan

• test_input_type_range_invalid — bound form with empty data → is-invalid present, is-valid absent
• test_input_type_range_valid — bound form with valid data → is-valid present, is-invalid absent
• Full test suite passes (137 tests)

🤖 Generated with Claude Code

[coveralls]

Coverage Report for CI Build 27935753341

Coverage remained the same at 96.014%

Details

• Coverage remained the same as the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	676
Covered Lines:	654
Line Coverage:	96.75%
Relevant Branches:	202
Covered Branches:	189
Branch Coverage:	93.56%
Branches in Coverage %:	Yes
Coverage Strength:	14.51 hits per line

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💛 - Coveralls