Square every corner, enlarge the main surfaces and add a to-do list

Rounded rectangles and round controls are now square across the app; only
status dots, glows, the sun, rings and the breathing circle stay round.
Cards, rows, thumbnails, featured cards, category tiles, the standing card
and the nav are larger. Home gets a quick To-do list kept on the device
(TodoItem in InternalMemory), seeded with sample items in mock mode.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KhQh614DMeYoQEH9SoMRUw

frontend/lib/Grounded/see/goal/GoalDetailState.dart

@@ -242,7 +242,7 @@ class GoalDetailState extends State<GoalDetail>
       padding: const EdgeInsets.fromLTRB(16, 14, 16, 14),
       decoration: BoxDecoration(
         color: colorWhite.withValues(alpha: 0.08),
-        borderRadius: BorderRadius.circular(16),
+        borderRadius: BorderRadius.zero,
       ),
       child: Column(
         mainAxisSize: MainAxisSize.min,
@@ -405,7 +405,7 @@ class GoalDetailState extends State<GoalDetail>
               width: 58,
               height: 58,
               child: ClipRRect(
-                borderRadius: BorderRadius.circular(16),
+                borderRadius: BorderRadius.zero,
                 child: SceneArt(
                   palette: scenePalette(routine.kind),
                   seed: sceneSeed(routine.title),
@@ -454,7 +454,6 @@ class GoalDetailState extends State<GoalDetail>
                   color: routine.kind == RoutineKind.MustDo
                       ? colorPrimaryDark
                       : tone,
-                  shape: BoxShape.circle,
                 ),
                 child: Icon(CupertinoIcons.play_fill,
                     size: 15, color: colorWhite),

frontend/lib/Grounded/see/goal/GoalEditorState.dart

@@ -282,7 +282,7 @@ class GoalEditorState extends State<GoalEditor> implements ConnectGoalEditor {
     return Container(
       padding: const EdgeInsets.all(18),
       decoration: BoxDecoration(
-        borderRadius: BorderRadius.circular(20),
+        borderRadius: BorderRadius.zero,
         gradient: LinearGradient(
           begin: Alignment.topLeft,
           end: Alignment.bottomRight,
@@ -338,7 +338,6 @@ class GoalEditorState extends State<GoalEditor> implements ConnectGoalEditor {
             alignment: Alignment.center,
             decoration: BoxDecoration(
               color: colour,
-              shape: BoxShape.circle,
               border: Border.all(
                 color: selected ? colorWhite : Colors.transparent,
                 width: 3,

frontend/lib/Grounded/see/goal/GoalsState.dart

@@ -117,10 +117,10 @@ class GoalsState extends State<Goals> implements ConnectGoals {
     return GestureDetector(
       onTap: () => _onOpenGoal(goal),
       child: Container(
-        height: 214,
+        height: 260,
         margin: const EdgeInsets.only(bottom: 14),
         decoration: BoxDecoration(
-          borderRadius: BorderRadius.circular(26),
+          borderRadius: BorderRadius.zero,
           boxShadow: const [
             BoxShadow(
               color: Color(0x262A3A30),
@@ -130,7 +130,7 @@ class GoalsState extends State<Goals> implements ConnectGoals {
           ],
         ),
         child: ClipRRect(
-          borderRadius: BorderRadius.circular(26),
+          borderRadius: BorderRadius.zero,
           child: Stack(
             fit: StackFit.expand,
             children: [
@@ -151,7 +151,7 @@ class GoalsState extends State<Goals> implements ConnectGoals {
                       children: [
                         GlassSurface(
                           onDark: true,
-                          radius: BorderRadius.circular(99),
+                          radius: BorderRadius.zero,
                           padding: const EdgeInsets.symmetric(
                               horizontal: 10, vertical: 5),
                           child: text(