Create a "clicker" game app with the following features: 1. **Main Screen:** * Display the user's current cash balance at the top of the screen. * Feature a large, central button that the user can tap. Each tap should increase the user's cash balance. * The initial value of each click is $1. 2. **Upgrades System:** * Display a list of available upgrades that the user can purchase with their cash. * Each upgrade increases the amount of cash earned per click (the "click multiplier"). * The upgrades are: * **Cost: $5**, Multiplier: **2x** * **Cost: $50**, Multiplier: **5x** * **Cost: $300**, Multiplier: **16x** * **Cost: $10,000**, Multiplier: **100x** * **Cost: $100,000**, Multiplier: **1000x** * **Cost: $1,000,000**, Multiplier: **10,000x** * A user should only be able to purchase an upgrade if they have enough cash. * Once an upgrade is purchased, the cost should be deducted from the user's balance, and their cash-per-click value should be updated immediately. The purchased upgrade should no longer be available. 3. **Backend and Data:** * Use a database to store each user's progress. * The user's current cash balance and their current click multiplier must be saved persistently. When the user re-opens the app, their progress should be loaded automatically. * All data should be linked to the currently logged-in user.

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