Fixes to switching Instagram accounts, to the first run and to suggested times.

• If you found Cora on TikTok or Instagram, you can now add the @ of the account where you saw it (optional).
• Suggested best times keep their clock time across a daylight-saving change.

Fixed
• Switching, removing and adding Instagram accounts now shows the right name and grid.
• Some people who installed Cora from a test build were shown the wrong Pro offer during the first run.