Google Calendar Group Manager

■ What it does Adds a group-management UI to the "Other calendars" section in Google Calendar's sidebar. ・Drag-and-drop calendars in/out of groups ・Pick any color for each group (color picker) ・Collapse groups to temporarily hide unrelated calendars ・Filter calendars and groups by name with a live search box ・Collapse the month-view mini-calendar at the top of the sidebar ・Reorder groups themselves via drag-and-drop ・Notion-style 6-dot drag handle for a familiar feel ■ Who it's for ・Anyone subscribed to many project, team, or organization calendars ・Users who want to organize calendars by purpose (team / personal / holidays / meetups) ・People who waste time scrolling the "Other calendars" list to find one specific calendar ・Anyone who finds Google Calendar's native organization features lacking ■ How to use 1. After installing, open Google Calendar (calendar.google.com) 2. Click "⚙ Group" in the top-right header to create your first group 3. Drag any calendar in the sidebar onto a group header to add it 4. To remove a calendar from its group, drag it anywhere outside the calendar list ■ Privacy ・Only requires the "storage" permission ・All data is stored locally in your browser (Chrome sync storage) ・Never reads or transmits calendar event content, attendees, or any personal data ・No external server communication ・Host permission limited to https://calendar.google.com/* ■ Release notes ▼ v1.0.0 (initial release) ・Group management UI in the "Other calendars" section ・Drag-and-drop add / move / remove ・Custom color per group ・Live calendar filter search box ・Mini-calendar accordion ・Group collapse state is auto-saved (persists across sessions)