Improved: Multi-workspace switcher

Switching between workspaces is now instantaneous. We've also added a keyboard shortcut: Cmd + K → type workspace name → Enter.

Fixed: GitHub issue tracker in dark mode

Labels and assignee avatars are now readable when using system-level dark mode (still respecting Uneo's light theme).

Changed: Pricing page wording

Clarified "Team" plan limits: now explicitly lists 15 users included, $8 per additional user.