feat: mock fork combined with updates

[marcomariscal]

updates:

• remove unnecessary connector logic
• useMemo and condense useAccountPlus and useApprovalMethod (looking to remove the approval method hook because it's redundant with our settings context)
• fixes fill eth button handling
• only render approve max setting when appropriate
• use default provider current block in useFork
• dynamic kill switch component to improve first load time

[marcomariscal]

@brucedonovan, this is this pr with some updates (detailed above).