MessageMe on Ubuntu Touch — install (portable tar.gz)

This is NOT an OpenStore / click package.
Do NOT tap the "messageme" file in File Manager and choose App Store —
install will fail with "not a valid click package".

Steps
-----
1. Download messageme-ubuntu-touch-arm64-*.tar.gz
2. Extract the MessageMe folder somewhere permanent, e.g.:
     ~/apps/MessageMe
3. Open Terminal and run:
     cd ~/apps/MessageMe
     chmod +x install-launcher.sh messageme messageme-launch.sh 2>/dev/null
     ./install-launcher.sh
4. Open the app drawer and pull down to refresh.
5. Tap the MessageMe icon (do not launch from Files).

First run also installs the drawer entry automatically if you start with:
     ./messageme
or:
     ./messageme-launch.sh

Background notifications
------------------------
While MessageMe is open, new messages use Lomiri Postal (same notification
center as Teleports).

To also get banners when the app is fully closed:
  1. Sign in
  2. Settings → Notifications → turn on Background notifications
  3. Optionally choose New message only vs Show message content
  4. Keep the phone online (Wi‑Fi or mobile data)

This starts a small always-on listener (`messageme --notify-watcher` via a
systemd user unit). It uses a little extra battery. Encrypted chats always
show a generic “New message” body.

On-screen keyboard
------------------
Flutter is a GTK app and Ubuntu Touch ships no GTK Maliit module, so the
system keyboard used to be unavailable. MessageMe now carries that module in
`lib/maliit/` and points GTK at it on startup — nothing to install, and the
read-only rootfs is untouched.

If the Lomiri keyboard still does not appear when you tap a text field, tap
"No keyboard? Tap for the in-app keyboard" just above the keyboard area. The
app then uses its own keyboard until the next MessageMe version.

Voice messages
--------------
Recording uses PulseAudio `parecord` (usually already present on Ubuntu Touch).
System `ffmpeg` is NOT required for voice notes.

If recording fails with a tools error:
  sudo mount -o remount,rw /
  sudo apt update
  sudo apt install -y pulseaudio-utils
  sudo mount -o remount,ro /

Updates
-------
In-app: Settings → App updates (bundled updater).
