Batch of fixes #1

[0xTax]

• Change the background color to the same as the DEX

• Overall tidy up the UI, remove unnecessary space/gaps from boxes, make the "swap/deposit/withdraw" bar one with the UI (edges overlap each other), align everything nicely.

• Move the Mint button to the "swap/deposit/withdraw/Mint" bar (eventually make the button disappear if not on testnet)

• Fix the connect wallet, approve, swap button not being visible

• Add insufficient funds button when inserting too much balance (if not already, unable to test because of starknet being down)

• When wallet is not connected, display connect wallet button instead of preview (deposit / withdraw options)

• When wallet is not connected, disable slider and % input

• Deposit preview screen button should be ''Deposit'' instead of ''Invest''

• Remove max button on proportional deposit, make the highlighted box the same as in withdraw but with no dropdown option, fix displayed amount
  

• Copy the highlighted design from DEX convert, similar font and highlight logic too.
  

• "my pool balance" should show the amount the user owns/has in the pool, not the overall pool stats
• Nicely space out and tidy deposit & withdraw preview screens
• "Swap" inputs should start empty and display faded in 0.00