chore: cycle & module sidebar improvement

[anmolsinghbhatia]

Problem:

At present, there isn't a way to eliminate a selected lead from the module lead dropdown in the sidebar and peek overview.

Resolution:

To address this, I've resolved the problem by including a "No Lead" choice within the dropdown options. This selection allows for the deselection of the currently selected member.

Other:

Cycle & module sidebar UI/UX Improvement

Media:

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These issues are associated with [PLE-151] and [PLE-160]