App structure: a swipe-in menu shell; pages/, link/, actions/; Settings

The shell (shell.dart): a drawer from the left edge or each page's menu button.
Dash, Signals, Captures; Tools (Camera, Link test, Orin power options), the
rarely used ones, after pirate-station-aide; Settings (gateway address, dark/bright,
build-time theme and landing). Landing view at build time: YUKART_HOME=dash|signals,
signals for now. Dash, Signals and Captures stay alive while hidden; Captures has its
own navigator, so a run survives switching views. Back goes inside Captures, then to
the landing view, then out. The mock banner sits over every page.

main.dart is startup only; the old home screen is pages/signals.dart; dialogs and
sheets moved to actions/; the protocol client, USB binding and Reading to link/.
lib/README.md catalogues it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

lib/widgets/telltale.dart

@@ -1,9 +1,9 @@
 // An on/off lamp in the boxed pattern (lib/widgets/stat_box.dart): the label is the
-// lamp. Takes a [Reading] (lib/reading.dart) so missing and stale draw as they do elsewhere.
+// lamp. Takes a [Reading] (lib/link/reading.dart) so missing and stale draw as they do elsewhere.
 
 import 'package:flutter/material.dart';
 
-import '../reading.dart';
+import '../link/reading.dart';
 import '../theme/palette.dart';
 
 /// An on/off lamp in the boxed pattern: the label is the lamp. Lit in foreground