* Multiple billing fixes
- Fix the open charge not having its amount + interval updated after
promoting the expiring subscription
- Fix proration rate being miscalculated (assumed the current
subscription interval was always monthly)
- Fix the open charge's interval and amount being updated on PATCH
/subscription/:id even if the payment intent was never confirmed
* Appease clippy
* Update apps/labrinth/src/routes/internal/billing.rs
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>
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Signed-off-by: François-Xavier Talbot <108630700+fetchfern@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>