- Move mobile styles into a selectable Oasis-Mobile-UX theme; mobile.css kept intact
- Hexagon category launcher on home (10 categories with expandable modules)
- Customizable bottom bar (up to 4 shortcuts, Peers/Invites fixed)
- Gold-outlined hexagons
- Activity and search show an empty state with a call to action.
- Selecting an activity type collapses the filters and adds a back arrow to change it.
- Bottom bar: replace Activity with a + slot to pin a module; hide slots for disabled modules.
- Add a reusable empty-state helper and the inbox empty state.
- Mobile styles and translations for the above.
- Pre-boot password gate (main.js) with language selector; backend starts only after unlock.
- keylock.js: scrypt KEK + AES-256-GCM wrap/unwrap of the SSB secret and keyrings.
- crypto.js: keyrings encrypted/decrypted with the KEK.
- ssb_config.js: decrypted keys in memory (no plaintext secret on disk).
