Refactor notifications + Add notification tab

[EnterpriseGoose]

Change notifications from being a slack-message-only system to having a first class notifications page, slack dms, and email support for more notification categories.

• In-app inbox at /my/notifications with realtime ActionCable updates and sidebar badge
• Per-user prefs page- Slack/email toggles grouped by category
• 12 typed notifications (follows, comments, devlogs, mission reviews, payouts, shop orders, etc.) wired through existing Slack call sites
• Priority channels- critical always-on, high is on by default, medium and low are off by default
• Aggregation (10 likes → 1 row) + digest delay so there isn't spam
• Branded HTML emails with per-type CTAs and unsubscribe footer
• Legacy preference columns backfilled and dropped

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​rails/​actioncable@​8.1.300

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[github-actions]

you SILLY GOOSE!

Model annotations have fallen out of date.

Please run bundle exec annotaterb models locally and commit the changes.