Rename and Style Dashboard

Rename Pending Request to describe this is where Musician has requested to play an event.

Rename Waiting for volunteers to describe this is an organization with an event that needs musicians to volunteer.

Style page to be more user friendly.

Add blank state messaging.

Start by locating the dashboard page and the existing “Pending Request” and “Waiting for volunteers” labels. Review how empty states are currently rendered, then define the revised wording, friendlier styling, and blank-state messages; done means the dashboard clearly distinguishes both situations and handles empty sections.

Written by the indexing model from the issue text.