Launcher: a grid of icons, with badges; the list stays as a Setting

The Launcher shows the Apps as a 4 x 3 grid of 32 x 32 icons, the
selected one's name under it (issue #9). The icons are the website's
own, doubled, and two drawn the same way for SSH and the Shell; they
are PNGs in assets/icons, turned into arrays by scripts/make_icons.py,
which CI checks. The selected tile is the website's: dark blue on cyan,
with notched corners.

- GridModel (lib/ui, host-tested) holds the selection and the scrolling.
- App::badge(): a dot on the tile for unread IRC messages, a Track
  recording, a Capture running, an SSH session open.
- Settings > Launcher: Grid or List.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0162FokPdvY2KsS4NBfwyWPk

lib/services/src/settings.h

@@ -41,6 +41,7 @@ enum class Setting : uint8_t {
     SshKey,           // string: this device's own SSH private key, as OpenSSH writes one: never shown
     SshPublic,        // string: its public half, the line to put in a server's authorized_keys
     SshFont,          // int: the terminal's font, 0 (smallest) to 4
+    LauncherList,     // bool: the Launcher is a list of names instead of a grid of icons (issue #9)
     Count
 };