Meta: prioritized issues

[ponbac]

Includes:

• Copy existing time entry into new running timer #29
• Overlap validation for time entries (client) #31
• Allow changing day (date) of a time entry #30
• Enforce previous month lock before starting new timer #32
• Edit saved entry: change project/activity/name #33
• Daily summary & basic statistics panel #34
• Add tooltips to floating timer icon buttons #35
• Light theme support & theming in general #36
• Switch deployment to new Spinit domain #37
• Add the ability to create new time entries without going through an active timer #42