SURFACES
- The Configure menu gains a **Discover installed apps** row. A row rather
than a form step, because a menu choice is dispatched with no user input:
it awaits the manager's bounded sweep and returns to the menu with a line
saying what was found. Discovery is therefore always explicit — never a
per-poll cost — and a failed sweep still renders the menu.
- The Apps table opens on the REAL app list: the stored rows first (kept
position, name and icon untouched) and then every discovered app, named
by its device label or its package id when the label fetch did not answer.
The user's entry for a package always wins over the device label.
- `sensor.<name>_installed_apps` (ADB-enabled entries only): state = app
count, `installed_apps` attribute = the same table, `discovery` attribute
= ok / pending / not_connected / adb_disabled. It polls through the
manager's TTL cache, so a poll on a fresh table issues no shell, and the
standard `homeassistant.update_entity` action refreshes it.
The discovered icon is deliberately NOT written into the icon column: that
column is documented as a picture URL or a `camera.*` entity feeding
`entity_picture`, and an `mdi:` name there would be a value the media
player cannot use. The icons are offered in the installed-apps attribute,
and the table's description names them.
strings.json + translations/en.json: the `installed_apps` entity name, the
Discover row label, and the menu description now carries {discovery}, so the
page says how many apps were found (or why none were).
README: an "App discovery" section documenting both commands, how system
and launcher entries are treated, the label/caching semantics, the icon
rule and its limits, the sensor surface and the fallback behaviour — and
that the source-list fallback stays the user's map, not the discovery.