Major changes in this commit:
- Rename app from NotiSaver to Alert Vault (package: com.roundingmobile.alertvault)
- Natural language filter rule editor (Thunderbird/BuzzKill-style sentence builder)
- Compound AND/OR conditions for filter rules (Pro-gated)
- 6 filter actions: don't save, save & dismiss, block, save as read, cooldown, alert
- App picker with 4 sections (any app, notification apps, installed apps, manual entry)
- Pro status provider with dev toggle in Settings
- Premium gate dialog for pro features
- Auto-dismiss from notification shade via cancelNotification
- Cooldown tracker (in-memory, per-rule per-app)
- Blue Steel (default) and Gold Vault (premium) app icons with activity-alias switching
- DB migration v3→v4: compound conditions JSON, condition operator, action params
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