release v1.9.1

Improvements

• Pre-release version suffixes now displayed: ESPHome versions with suffixes like 2026.4.5b1, -dev, rc1 or a1 are now correctly shown in the frontend.
• Offline devices now show pending project version bumps: The project version cache is updated for all devices (online and offline), so the frontend can show a pending project bump even when the device is currently offline.
• Clearer auto-update setting: Renamed "Auto install" to "Auto install trigger" to better convey what the checkbox actually does.

Bug Fixes

• External devices with firmware + project update: Fixed an issue where the from and to ESPHome versions were swapped in the displayed update info.
• Duplicate yaml config fetch removed: When auto-install was enabled with pending updates, the integration fetched each device's yaml config twice from the dashboard. Now reduced to a single fetch via shared caching.
• Minor frontend fine-tuning: Various small UI polish and tweaks.