Fix using elementId in handleElementFocus script

[wendevlin]

Summary

• Fix ReferenceError: Can't find variable: elementId crashes iOS companion app on device/integration pages (2026.3) frontend#30048
• elementId inside the JS was used in the return string, but not escaped so JS fails.
  • I am actually not sure if this return string is even needed. Does it have any sense?

Screenshots

Link to pull request in Documentation repository

Documentation: home-assistant/companion.home-assistant#

Any other notes

• when this is releases we activate again the functionality in the frontend: Temporarily disable "focus_element" implementation for iOS app frontend#30226

[Copilot]

Pull request overview

Fixes the injected handleElementFocus JavaScript so elementId is defined within the script (avoiding a ReferenceError when building the return string), related to frontend issue home-assistant/frontend#30048.

Changes:

• Define const elementId in the injected JS and pass it into findElementInShadowDOM(...).
• Simplify the “not found” return path to a single return statement.
• Minor JS iteration style change (for (const el of ...)).

[bgoncal]

@wendevlin It's not really needed I guess, it was more a debug thing, I will remove it

[codecov]

Codecov Report

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