Add Blux to the Wallet Integration page

[ceydae]

What this PR does

Adds Blux to the Wallet Integration page (docs/tools/developer-tools/wallets.mdx)
so Stellar developers can discover it as an onboarding and wallet-connection
option for their dApps.

About Blux

Blux is a Stellar Community Fund (SCF) awarded project. It has completed its
testing phase and is now in a stable release, ready for production use by
developers and end users.

Highlights:

• Sign in with email, social accounts (Google, Discord, GitHub, X, LinkedIn,
  and more), or passkeys
• Supports a broad range of Stellar wallets: Freighter, Rabet, WalletConnect,
  HOT Wallet, Hana, xBull, Lobstr, Albedo, Bitget, OneKey, Ledger, and Trezor
• Pre-built hooks and modals for transaction signing, balance checking, swaps,
  transaction history, and on/off-ramp flows
• Type-safe, TypeScript-first SDKs for React and vanilla JavaScript
• Fully configurable modal system to match each dApp's branding
• User analytics from the Blux dashboard

Links

• Website: https://blux.cc/
• Docs: https://docs.blux.cc/
• Demo: https://demo.blux.cc/

[Copilot]

Pull request overview

This PR updates the Wallet Integration documentation to include Blux as a supported onboarding and wallet-connection option for Stellar dApps, making it discoverable alongside other ecosystem tools.

Changes:

• Add a new “Blux” section with a product overview, demo image, supported sign-in methods, supported wallets, and a docs link.
• Fix a typo/formatting issue in the Stellar Wallet Kit wallet list (“Trezor Hardware Wallet”).

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