api | web: let teams upload custom icons and use an up-down chevron - #11

Teams can now set their own icon. The team switcher now uses an up-down chevron.

Icon storage

• Teams can upload an SVG, PNG or JPEG icon of up to 50 KB.
• Icons are stored in Postgres in a new team_icons table, with one row per team. The row is unique on team_id and is removed with ON DELETE CASCADE when its team is deleted.
• New migration: 20261016222621_team_icons.sql.
• The team response, the OpenAPI spec and the generated web client now include the icon. The team docs were updated.

How icons look

• A team with no uploaded icon shows the first letter of its name in a circle: the background uses the text color and the letter uses the background color.
• An uploaded icon is cropped to a circle with a border.
• The icon shows in the navbar, the team switcher and the mobile sheet.

Team settings

• The general tab now has two cards:
  • Team Details, with regular inputs for name and description
  • Team Avatar, where hovering over or pressing the avatar shows an edit control
• Both cards use a new shared SettingsCard, which puts the save action in the footer like the variables section does. The rename card on the project settings page uses it too.

Testing

• Added unit tests for the team icon repository (repositories/team/icon_test.go).
• Added unit tests for icon file validation (services/team/icon_file_test.go).
• Regenerated the repository mocks.