Fix LTR390 interval lambda: handle NAN state, remove boot timing guard

[bharvey88]

Version: 26.3.2.1

What does this implement/fix?

Fixes two issues in the LTR390 interval lambda introduced in #56:

• NAN cast: (uint32_t)id(ltr390_update_interval).state is undefined behavior when the template number hasn't initialized yet (state is NAN). Replaced with a ternary that falls back to 60s when the value is not >= 1.0f — NAN comparisons return false so this handles both cases.
• Boot timing guard: last_update == 0 && current_time > 0 prevented the immediate boot update from firing in the first second (millis() / 1000 == 0). Removed current_time > 0 so the update fires on the first tick whenever last_update == 0.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

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📥 Commits

Reviewing files that changed from the base of the PR and between 0a5b139 and a6d74c1.

📒 Files selected for processing (1)

• Integrations/ESPHome/Core.yaml

✨ Finishing Touches

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• Commit unit tests in branch fix-ltr390-interval-lambda

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