chore(deps): bump solar-positioning from 0.6.1 to 0.7.0 in /backend

[dependabot]

Bumps solar-positioning from 0.6.1 to 0.7.0.

Changelog

Sourced from solar-positioning's changelog.

[0.7.0] - 2026-09-26

Changed

• BREAKING: for_time_from_julian now returns Result; estimate_from_date_like borrows its input.
• BREAKING: Replace position and sunrise/sunset APIs with SolarPositions, PreparedPositions, SolarEvents and Events<T>. Public types are exported at the crate root.
• Events use precise SPA, Grena3 or custom positions and support missing or multiple events per day. The standard sunrise horizon is −50/60°.
• BREAKING: Replace time::DeltaT with delta_t functions. Make Error non-exhaustive, with core::error::Error support also without std.
• BREAKING: Use the proleptic Gregorian calendar throughout; Grena3 requires zero observer height.
• BREAKING: Move to Rust edition 2024 (MSRV 1.85).
• Add alloc for event lists; numeric positions and bounded searches work without allocation or chrono.

Fixed

• Enforce position models' UT/TT date ranges and preserve exact chrono boundaries in event validation.
• Remove Grena3's rounded-hours artifact by using continuous Julian time.
• Prevent SPA roundoff errors at zenith and nadir.
• Reject refraction temperatures at or below −273°C.

Commits

• 8ee4015 Release 0.7.0
• 78a8023 feat!: solar events and API overhaul (#8)
• 2beb262 fix: handle dates without a solar transit
• See full diff in compare view

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