1. Add "grabbing" cursor while dragging items:

2. Make project board only drag via their header, not via their whole
body.

3. Fix some cursor problems in projects
4. Move shared options into `createSortable`.
(cherry picked from commit 7fda109aba6cd077343edef086b2f2ff60124f78)
I propose to decrease font size. 18 is too big and looks ugly, on
windows. 14 is on par with other elements and save a bit of space.


Co-authored-by: Nikolay Kobzarev <n.kobzarev@aeronavigator.ru>
This PR refactors a bunch of projects-related code, mostly the
templates.
The following things were done:
- rename boards to columns in frontend code
- use the new `ctx.Locale.Tr` method
- cleanup template, remove useless newlines, classes, comments
- merge org-/user and repo level project template together
- move "new column" button into project toolbar
- move issue card (shared by projects and pinned issues) to shared
template, remove useless duplicated styles
- add search function to projects (to make the layout more similar to
milestones list where it is inherited from 😆)
- maybe more changes I forgot I've done 😆Closes#24893
After:



---------
Co-authored-by: silverwind <me@silverwind.io>