Improve mobile calendar presentation and Caelus header alignment

[mot-yelraf]

Summary

Center the Caelus header and align its top edge with the close button, with spacing to prevent overlap on phones. Reorder mobile BD Cal tiles to Calendar, Summary/Plantings/Notes, Moon Attributes, Planetary Aspects, Twelve-Month Overview, and the BD Cal icon while retaining the desktop tile layout.

Arrange the BD Cal header into three centered lines: title; date/time; Report, coordinates, and Theme. Update the version to v0.26.275.3.

Verification

• npm run validate:pr: all 50 Playwright Chromium checks passed on the final changes.
• Additional browser layout assertions passed at 320, 390, 768, and 1440 pixels; inspected desktop and phone screenshots.
• git diff --check: passed.
• User visually verified the result.
• Host: macOS, Python 3.13.9. Isolated fixture, no MQTT broker or direct hardware required.

Contributor checklist

• This pull request is focused on one logical change.
• Behavior changes verified using existing tests and targeted browser assertions; no permanent tests added for this presentation-only change.
• Canonical documentation reviewed; no configuration or documented workflow changes required.
• No credentials, private runtime configuration, databases, or logs committed.
• Compatibility-sensitive MQTT, settings, switch identity, and persistence behavior preserved.

Maintainer verification

• All remote checks passed: Python compile (3.11 and 3.13), regression suite and coverage floor.
• npm run validate:pr passes on a trusted host.
• Unverified areas recorded below.

Residual risk or unverified areas

Physical mobile devices and non-Chromium browsers were not tested. Hardware, MQTT, and onboarding paths were not exercised; changes are limited to presentation and the version marker.