100 Days of Solana — Days 1–4: Keys, Lamports, and My First Browser Wallet

I've been doing the #100DaysOfSolana challenge and I want to share what the first four days looked like — because the mental shift from Web2 to Web3 hit me harder and faster than I expected. I generated my first Solana keypair using the CLI and airdropped free SOL to it on devnet. There was no sign