Refactored /seller/fundraiser/:id page with Cached Analytics Data and Component

[EricWeng23]

This PR refactors the analytics page implemented in #38, using cache data from the new fundraiser analytics backend route /fundraiser/:id/analytics. Previously we had designated frontend route for analytics and order data in seller/fundraiser/[id]/analytics and seller/fundraiser/[id]/orders respectively. For the sake of simplicity, we are merging these two pages into a single route seller/fundraiser/[id].

Screen.Recording.2025-10-26.at.4.09.01.PM.mov

NOTE:
Notice that when updating the pickup status of an order, this does not directly update the database and only updates the local SWR cache. To reflect the changes, we must refresh the page for the change to propagate to the database and for the updated cache data to render in the frontend. This was a persistent bug since SP24, and we will have to address this sooner or later!

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[Arsh-S]

Hey Eric, great work on the cached analytics system! I believe there is an edge case/bug that can cause double-counting of revenue and incorrect pending order counts:

When an order's payment is CONFIRMED (but not yet picked up):

1. Cache recalculation treats it as paid:

• Adds revenue to the cache calculateAndCacheFundraiserAnalytics
• Does NOT add to pending_orders (only non-paid orders increment pending)

2. Later, when the order is picked up, updateCacheForOrderPickup:

• Adds revenue AGAIN → double-count
• Decrements pending (even though this order was never in pending!) → can go negative

Root Cause:

• In completeOrderPickup, the query doesn't SELECT paymentStatus, so updateCacheForOrderPickup assumes every picked-up order was previously pending and always adds revenue.

Suggested Fix

1. Add paymentStatus to the query in completeOrderPickup
2. Update the function to pass paymentStatus
3. Check if the order was already CONFIRMED before updating analytics, and update the proper analytics only.