Fix sync state dropdown rendering and add option labels

[IHateToSelectAUsername]

Fixes TypeScript type errors in knx-sync-state-selector-row component.

The issue:
ha-selector-select expects string values, but we were mixing booleans (true/false) with strings ("init", "expire", "every"), causing TypeScript errors.

The fix:

• Convert booleans to strings internally ("true"/"false")
• Map back to booleans when sending to backend
• Backend API stays unchanged (still receives true/false as booleans)

Related to #157

before:

after:

[codecov]

Codecov Report

❌ Patch coverage is 0% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.36%. Comparing base (5556760) to head (f3ba2e8).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/knx-sync-state-selector-row.ts	0.00%	34 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #276      +/-   ##
========================================
- Coverage   3.36%   3.36%   -0.01%     
========================================
  Files         55      55              
  Lines      10150   10174      +24     
  Branches     156     156              
========================================
  Hits         342     342              
- Misses      9808    9832      +24     

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[Copilot]

Pull Request Overview

This PR fixes TypeScript type errors in the knx-sync-state-selector-row component by ensuring all values passed to ha-selector-select are strings, while maintaining backward compatibility with the backend API that expects boolean values.

Key changes:

• Convert boolean strategy values to string literals ("true"/"false") for frontend compatibility
• Add bidirectional conversion between string and boolean representations
• Update type annotations to reflect string-only internal handling

[Copilot]

Type assertion required here suggests a type mismatch. Consider updating _options getter return type to readonly string[] instead of using an assertion at the call site, making the type system work for you rather than against you.

[IHateToSelectAUsername]

Implemented. Changed to readonly string[] which removes the need for the type assertion.

[farmio]

Hi 👋!

Thank you very much for your contribution!
Feel free to ignore the code coverage tests - we don't really enforce that. For the AI review comments, please have a look - those seem legit to me, but I'm not very good at TS 😬

[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

[Copilot]

Using as any defeats TypeScript's type safety. Use a type predicate or assertion function instead: if (validStrategies.includes(strategy as (typeof validStrategies)[number]))

[farmio]

Very nice 👍 Thank you!