feat: switch to Jupiter V3 price API & add timeframe limitation filter

[HkSolDev]

solfees.mp4

Summary of Changes

This PR addresses two main improvements:

1. Upgraded SOL price feed to Jupiter V3: The deprecated Jupiter V2 API (lite-api.jup.ag/price/v2) was returning a 404. I implemented a secure server-side proxy route at /api/price that fetches from Jupiter V3 with the secret API key. The client hook useSolPrice.ts now calls this proxy, protecting private keys from being exposed in client-side code.
2. Added Timeframe Limitation Filter (Issue Add possibility to limit the timeframe #27): Added a pills selector (1 Hour, 24 Hours, 7 Days, All Time) to the main form. The fetching loop now calculates the cutoff timestamp in hours and breaks the loop early to avoid downloading thousands of transactions for highly active wallets.
3. Real-time scanning updates: Switched the transaction aggregator to run dynamically as batches arrive, updating stats (SOL fees, USD fees, average) in real-time while displaying a pulsing loading banner at the top of the Results card.
4. Prevented Empty-Timeframe Crashes: Initialized firstTransactionTS to 0 when there are no transactions (preventing range errors in JS Date) and displaying a friendly warning when no transactions are found.

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