Redesign status dashboard: light theme, clickable events, footer
- Always light (Atlassian-style), no more automatic dark mode
- Each calendar tooltip entry and each recent commit links directly to
the forge issue/PR/commit or the Radicle explorer page it produced
- Fixed the tooltip being clipped by the calendar's horizontal scroll
container (overflow-y: visible instead of the inherited overflow: auto)
- Footer with the source repository link and license
- activity_log now stores a URL per entry; new optional config fields
source_url (footer link) and radicle.explorer_url (Radicle links)