[Calendar] Improve topbar for calendar

[dantetemplar]

Describe the feature

For now it is hard to get to know about "Sources", "Week", "Month", "List" features of calendar view because the topbar is obscure.

Suggested solution

• Month and arrows take too much space, we can convert "October" to "Oct", make arrows much smaller, and also reduce paddings.
• We should differentiate buttons: (Month, Today), (Sources), (3 days, Week, Month, List). Maybe by color or something. The most attractive should be Sources because it is most complex for understanding.
• ? When horizontal scroll appears we should notify user about extra options that are not visible
• ? (Month, Today) may be moved inside the Calendar component.

Additional context

No response

[dantetemplar]

Also we can add separate button "Export" if possible.

[dantetemplar]

Mark it as Urgent because it is no longer possible to endure...