fix: injected wallet

[gagdiez]

I have changed a couple of things on the bitte-ai/wallet package:

1. Fixed on package.json some very small inconsistency when declaring what cjs and esm files are exported
2. I have included the .js extension on the bitte-wallet.ts imports [note bellow]
3. I fixed signAndSendTransaction, which was creating a transaction that the wallet does not need
   3.1. Removed createTransaction as it is not needed
4. Changed the name of the localStorage keys, prepending bitte: to them, to avoid collisions with MyNearWallet

[note] In all honesty, I was expecting tsup to take care of this, but in the spirit of not changing the code much I have opted for the simplest solution.