Add volume control to bottom panel

Changes:
- Import a reworked version of the KUKSA.val client code from the
  Flutter dashboard app, with the aggregated signal Riverpod provider
  replaced with per-signal providers for the signal the homescreen
  needs and a couple of temperature ones it might use.  Using separate
  providers is more in-line with recommended Riverpod best practices.
- Various tweaks to enable using Riverpod.
- Split the bottom panel out into its own widget, and add a stack in
  it to layer the default logo panel with the volume control slider,
  which has been added as a new widget definition to provide the hook
  to drive timer based lowering behavior like the Qt homescreen does.
- The KUKSA.val connection widget has been added to the bottom panel
  rather than overriding the top-level widget as in the dashboard and
  HVAC apps.  This seems preferable with respect to still providing
  some functionality in the event KUKSA.val is unavailable.
- Remove the old demo dashboard and HVAC pages that are now unused,
  along with the image assets they needed, to allow cleaning up
  pubspec.yaml and ease maintenance.

Bug-AGL: SPEC-4659

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I5d9180a3461948a58321564e71134c4961ce0ef7

1 files changed, 13 insertions, 5 deletions

diff --git a/lib/main.dart b/lib/main.dart
index c09f328..f5ea0f7 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,14 +1,22 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_homescreen/homescreen.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_homescreen/vehicle-signals/viss_config.dart';
 
-void main() {
-  runApp(MyApp());
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  HttpClient client = await initializeClient();
+  runApp(ProviderScope(child: MyApp(client: client)));
 }
 
-class MyApp extends StatelessWidget {
+class MyApp extends ConsumerWidget {
+  MyApp({Key? key, required this.client}) : super(key: key);
+  final HttpClient client;
+
   // This widget is the root of your application.
   @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context, WidgetRef ref) {
     const navBarColor = const Color(0xff181818);
     const navBarIconColor = Colors.white;
 
@@ -24,7 +32,7 @@ class MyApp extends StatelessWidget {
               color: navBarIconColor,
             ))),
       ),
-      home: Homescreen(),
+      home: Homescreen(client: client),
     );
   }
 }