Reorders the itemized charge breakdown in the subscription upgrade
preview dialog to: Plan → Tax → Subtotal → Unused Time → Credits. Also
appends a "Includes proportional tax if applicable" note to the unused
time tooltip when tax is being applied, so users understand the prorated
credit already reflects tax.
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## Summary by CodeRabbit
* **Bug Fixes**
* Reorganized proration breakdown display order in subscription plan
updates for improved clarity.
* Enhanced unused time charge tooltip to conditionally include tax
information.
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Ignacio Dobronich
18e21a410b