feat(explorer): More obvious actions

[roaga]

• show action buttons on hover and add a little animation to them
• make it more obvious when the panel is minimized and how to get it back (see screenshot)

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
12184	1	12183	10

View the top 1 failed test(s) by shortest run time

BlockComponent Response Blocks calls onClick when response block is clicked

Stack Traces | 0.041s run time

Error: expect(jest.fn()).toHaveBeenCalledTimes(expected)

Expected number of calls: 1
Received number of calls: 0
    at Object.toHaveBeenCalledTimes (.../views/seerExplorer/blockComponents.spec.tsx:83:27)

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