Dart 3.9 / Flutter 3.35 [first LLM release] (#2714)

I got carried away with Gemini and basically rewrote CI and the release
process for the new LLM reality. This work was largely completed by
Gemini.

- Bump all SDK versions to the current beta (3.9.0-0)
- Run `flutter channel beta`
- Wrote `ci_script.dart` to replace the bash scripts
- Converted repository to pub workspace #2499 
- Added llm.md and release.md
- Added redirect for deprecated Samples Index

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I have added sample code updates to the [changelog].
- [x] I updated/added relevant documentation (doc comments with `///`).

veggieseasons/lib/widgets/detail_buttons.dart

@@ -86,11 +86,14 @@ class ShareButton extends _DetailPageButton {
 
 /// A favorite button that invokes a callback when pressed.
 class FavoriteButton extends _DetailPageButton {
-  const FavoriteButton(VoidCallback onPressed, bool isFavorite, {super.key})
-    : super(
-        onPressed,
-        isFavorite ? CupertinoIcons.heart_fill : CupertinoIcons.heart,
-      );
+  const FavoriteButton(
+    VoidCallback onPressed,
+    bool isFavorite, {
+    super.key,
+  }) : super(
+         onPressed,
+         isFavorite ? CupertinoIcons.heart_fill : CupertinoIcons.heart,
+       );
 }
 
 class _DetailPageButton extends StatefulWidget {
@@ -124,15 +127,16 @@ class _DetailPageButtonState extends State<_DetailPageButton> {
           child: Container(
             width: 30,
             height: 30,
-            decoration: BoxDecoration(borderRadius: BorderRadius.circular(15)),
+            decoration: BoxDecoration(
+              borderRadius: BorderRadius.circular(15),
+            ),
             child: Center(
               child: ColorChangingIcon(
                 widget.icon,
                 duration: const Duration(milliseconds: 300),
-                color:
-                    tapInProgress
-                        ? Styles.closeButtonPressed
-                        : Styles.closeButtonUnpressed,
+                color: tapInProgress
+                    ? Styles.closeButtonPressed
+                    : Styles.closeButtonUnpressed,
                 size: 20,
               ),
             ),

veggieseasons/lib/widgets/veggie_card.dart

@@ -93,8 +93,9 @@ class VeggieCard extends StatelessWidget {
               decoration: BoxDecoration(
                 image: DecorationImage(
                   fit: BoxFit.cover,
-                  colorFilter:
-                      isInSeason ? null : Styles.desaturatedColorFilter,
+                  colorFilter: isInSeason
+                      ? null
+                      : Styles.desaturatedColorFilter,
                   image: AssetImage(veggie.imageAssetPath),
                 ),
               ),

veggieseasons/lib/widgets/veggie_headline.dart

@@ -67,6 +67,9 @@ class VeggieHeadline extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final themeData = CupertinoTheme.of(context);
+    final String location = GoRouter.of(
+      context,
+    ).routerDelegate.currentConfiguration.uri.toString();
 
     return GestureDetector(
       onTap: () {
@@ -74,7 +77,7 @@ class VeggieHeadline extends StatelessWidget {
         // so navigate to the absolute route, which can be either
         // `/favorites/details/${veggie.id}` or `/search/details/${veggie.id}`
         // see https://github.com/flutter/flutter/issues/108177
-        context.go('${GoRouter.of(context).location}/details/${veggie.id}');
+        context.go('$location/details/${veggie.id}');
       },
       child: Row(
         crossAxisAlignment: CrossAxisAlignment.start,
@@ -93,7 +96,10 @@ class VeggieHeadline extends StatelessWidget {
               children: [
                 Row(
                   children: [
-                    Text(veggie.name, style: Styles.headlineName(themeData)),
+                    Text(
+                      veggie.name,
+                      style: Styles.headlineName(themeData),
+                    ),
                     ..._buildSeasonDots(veggie.seasons),
                   ],
                 ),

veggieseasons/lib/widgets/veggie_seasons_page.dart

@@ -19,7 +19,8 @@ class VeggieSeasonsPage<T> extends Page<T> {
 }
 
 class VeggieSeasonsPageRoute<T> extends PageRoute<T> {
-  VeggieSeasonsPageRoute(VeggieSeasonsPage<T> page) : super(settings: page);
+  VeggieSeasonsPageRoute(VeggieSeasonsPage<T> page)
+    : super(settings: page);
 
   VeggieSeasonsPage<T> get _page => settings as VeggieSeasonsPage<T>;