dev - next slow release#400

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dfulu wants to merge 6 commits intomainfrom

dev_feb2026_speedups

Commits on Feb 26, 2026

Speedup: Add optional LightDataArray backend and migrate datetimes to np.datetime64 (#397)
dfulu
committed

Commits on Mar 3, 2026

Speedup: Switch to faster solar coordinate algorithm (#398)
dfulu
authored

Commits on Mar 5, 2026

Switch to only use `.isel()` indexing (#399)
dfulu
authored

Commits on Mar 23, 2026

Flatten sample dict (#403)
dfulu
authored

Commits on Mar 25, 2026