Minor styling updates

[ylembachar]

• Transaction Overview Icon should be in normal weight (now in bold)
• Fix tooltip for inclusion chart (says in seconds -> Estimated time for a transaction to be included)
• Change "Executed Transactions" to "Included Transactions" in the gauge and center it
• When hovering over the inclusion chart values, only the final one is displayed

Slot overview page: Transaction table design is a bit different than Figma file:

• have all hashes in blue
• card needs a line on top
• there should be no line below the field names
• the field names should be in grey