Add Bluetooth Proxy firmware switching from HA

[bharvey88]

Version: 26.7.8.5

What does this implement/fix?

The second half of the ApolloAutomation/AIR-1#107 split: Bluetooth Proxy switching from HA. Users can turn an MSR-1 into a Bluetooth proxy (and back) with a dropdown instead of a USB reflash or YAML editing.

• Bluetooth Proxy select (Disabled/Enabled) joins the Firmware Channel select in composing the OTA manifest URL via apply_ota_source (one-line change: the variant now comes from the select instead of the build-time substitution).
• Boot truth-sync: on boot each image publishes what it actually is into the select (ble_firmware substitution), so a failed or abandoned switch snaps back to reality on reboot.
• Same-version variant switches install via the existing Firmware Update force button (merged in Add Firmware Channel switching from HA #89), which already disables BLE during the download to free heap for TLS.

No workflow changes - beta and Pages already publish both variants and their manifests, so this is one file, Core.yaml only.

To test on hardware: flash the standard image from the rolling beta release, flip Bluetooth Proxy to Enabled, press Firmware Update - the device should reinstall as the BLE image and the select should still read Enabled after reboot. Flip back to test the reverse path. Abandon a switch (toggle without pressing the button, then reboot) to see the truth-sync snap the select back.

Both selects config-validated on all three variants (ESPHome 2026.6.4). Not yet tested on hardware.

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

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added a new Bluetooth Proxy toggle in the device interface, allowing Bluetooth proxy mode to be switched on or off.
  • Devices now apply the selected OTA source automatically at startup.

• Bug Fixes

  • Improved consistency so the Bluetooth proxy setting is correctly restored and applied after reboot.

[coderabbitai]

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: adding Home Assistant-controlled Bluetooth Proxy firmware switching.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ble-proxy-select

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