tesks-ui: Projects screen + new-project/releases/teams forms — on-demand modal forms, restyle

Projects screen looks poor overall and the forms read as an afterthought.

• The new-project form is always-rendered and ugly. Make it open on demand from a + button (modal/popover) using a shared dialog primitive, and restyle the form itself.
• Apply the same form pattern to the Releases page form and the Teams/Integrations forms (always-open, real-estate-hogging forms → on-demand dialog + restyle).
• General visual cleanup of the projects list/cards to match the shared container width + card styling from the Navbar-issue foundations.

Files: app/(app)/w/[workspace]/projects/*, releases/*, teams/*, components/Form. Commit to develop, ref this issue.