Show total hours per person for full sprint and have hours reduce as they place chips

Show the total hours the user has to work with for that sprint (ex. 40 hrs, 32 hrs.).
When user places a chip on a project, the hours reduce that amount placed.

No files or tests are named. Start by locating the sprint-hours display and the code handling chip placement, then trace how a user's available hours are calculated. Done means the full sprint total is shown and decreases by the hours assigned to each placed chip.

Written by the indexing model from the issue text.