feat(design): surface phase — Lucide icons, input radius, Illuminated Transcript, ActionColors

Per-screen application of the design system to the Flutter app.
Mirrors the web's surface phase landed in FabledScribe v26.04.28.1.
Foundation port shipped in 0f05f47; this is the surface work.

Lucide icon migration
- Added lucide_icons ^0.257.0 dependency
- 107 Material Icons references → LucideIcons across 21 files. Drop-in
  IconData swap (Icon(LucideIcons.X) instead of Icon(Icons.x)).
- Lucide import added to each touched file.

Input border radius
- theme.dart inputDecorationTheme borderRadius 24 → 8 in both light
  and dark themes. Doc says radius-md (8px) for inputs; previous pill
  shape was Material default that the doc deviates from.

Illuminated Transcript pattern (ChatMessageBubble)
- User bubble: accent-tinted border → neutral Pewter (scheme.outline).
  Asymmetric corner already correct (bottomRight 4px).
- Assistant bubble: topLeft corner 4 → 16; only bottomLeft stays 4
  (the "tail" effect, mirroring web's `border-bottom-left-radius: 4px`).
  Background switched from surfaceContainerHighest (Slate) to surface
  (Iron) per the doc spec "card surface".
- Assistant bubble glow shadow added — accent-tinted blur (28px alpha
  0.14) + depth shadow (8px alpha 0.4 black). Mirrors web's
  --color-bubble-asst-shadow.

ActionColors wiring (Hybrid rule)
- 5 'Delete' confirm buttons across notes / tasks / chat conversations
  / calendar event sheet → Oxblood action-destructive via the
  ActionColors ThemeExtension defined in the foundation port. Foreground
  for ghost/text variants, backgroundColor for filled.
- Calendar event Save button → Moss action-primary. The first call
  site to wire ActionColors.primary; serves as the pattern for future
  Save reclassifications.
- Other Save buttons (note edit, task edit, project edit, etc.) still
  flow through colorScheme.primary (dusty violet) and read as
  brand-moment. Reclassifying those is deferred — the wiring pattern
  is established and can be applied incrementally as files are touched.

Indigo cleanup
- 4 hardcoded #7C3AED / #5B21B6 literals → dusty-violet equivalents
  (#5B4A8A / #3F3560). Spots: project_tasks_screen color fallback
  (×2), journal_screen gradient.

Verification
- flutter analyze: No issues found

What's deferred
- Per-screen Save / Cancel reclassification beyond the calendar event
  Save button. Wiring pattern established; rollout opportunistic.
- Long-form 1.7 line-height on assistant Markdown content (would
  require MarkdownStyleSheet work; minor).
- Surface walk on Knowledge / Projects / Settings screens for any
  hardcoded styling that needs touch.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/widgets/chat_message_bubble.dart

@@ -41,13 +41,16 @@ class ChatMessageBubble extends ConsumerWidget {
           maxWidth: min(MediaQuery.of(context).size.width * 0.82, 480),
         ),
         margin: const EdgeInsets.symmetric(vertical: 4, horizontal: 4),
+        // Illuminated Transcript pattern (mirrors web's ChatMessage.vue):
+        // - User bubble: transparent bg, neutral Pewter border, only the
+        //   bottom-right corner clipped (the "from-me" tail).
+        // - Assistant bubble: card surface, 2px accent left edge (the
+        //   "illuminated capital"), accent-tinted glow shadow + depth
+        //   shadow, only the bottom-left corner clipped.
         decoration: isUser
             ? BoxDecoration(
                 color: Colors.transparent,
-                border: Border.all(
-                  color: scheme.primary.withValues(alpha: 0.35),
-                  width: 1,
-                ),
+                border: Border.all(color: scheme.outline, width: 1),
                 borderRadius: const BorderRadius.only(
                   topLeft: Radius.circular(16),
                   topRight: Radius.circular(16),
@@ -56,16 +59,28 @@ class ChatMessageBubble extends ConsumerWidget {
                 ),
               )
             : BoxDecoration(
-                color: scheme.surfaceContainerHighest,
+                color: scheme.surface,
                 border: Border(
                   left: BorderSide(color: scheme.primary, width: 2),
                 ),
                 borderRadius: const BorderRadius.only(
-                  topLeft: Radius.circular(4),
+                  topLeft: Radius.circular(16),
                   topRight: Radius.circular(16),
                   bottomLeft: Radius.circular(4),
                   bottomRight: Radius.circular(16),
                 ),
+                boxShadow: [
+                  BoxShadow(
+                    color: scheme.primary.withValues(alpha: 0.14),
+                    blurRadius: 28,
+                    offset: const Offset(0, 4),
+                  ),
+                  BoxShadow(
+                    color: Colors.black.withValues(alpha: 0.4),
+                    blurRadius: 8,
+                    offset: const Offset(0, 2),
+                  ),
+                ],
               ),
         child: Padding(
           padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),

lib/widgets/journal_prep_card.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:lucide_icons/lucide_icons.dart';
 import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
 
 import '../data/models/message.dart';
@@ -46,7 +47,7 @@ class _JournalPrepCardState extends State<JournalPrepCard> {
           children: [
             Row(
               children: [
-                Icon(Icons.menu_book_outlined, size: 18, color: scheme.primary),
+                Icon(LucideIcons.bookOpen, size: 18, color: scheme.primary),
                 const SizedBox(width: 8),
                 Text(
                   _todayLabel(),

lib/widgets/knowledge_item_card.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:lucide_icons/lucide_icons.dart';
 import 'package:go_router/go_router.dart';
 
 import '../data/models/knowledge_item.dart';
@@ -8,11 +9,11 @@ class KnowledgeItemCard extends StatelessWidget {
   const KnowledgeItemCard({super.key, required this.item});
 
   IconData get _icon => switch (item.noteType) {
-        'person' => Icons.person_outlined,
-        'place' => Icons.place_outlined,
-        'list' => Icons.checklist_outlined,
-        'task' => Icons.task_alt_outlined,
-        _ => Icons.description_outlined,
+        'person' => LucideIcons.user,
+        'place' => LucideIcons.mapPin,
+        'list' => LucideIcons.listChecks,
+        'task' => LucideIcons.checkCircle2,
+        _ => LucideIcons.fileText,
       };
 
   Color _statusColor(BuildContext context) {

lib/widgets/offline_banner.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:lucide_icons/lucide_icons.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../providers/auth_provider.dart';
@@ -40,7 +41,7 @@ class _OfflineBannerState extends ConsumerState<OfflineBanner> {
           padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
           child: Row(
             children: [
-              Icon(Icons.cloud_off_outlined,
+              Icon(LucideIcons.cloudOff,
                   size: 18, color: scheme.onErrorContainer),
               const SizedBox(width: 8),
               Expanded(

lib/widgets/tool_call_chip.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:lucide_icons/lucide_icons.dart';
 import 'package:go_router/go_router.dart';
 
 import '../core/constants.dart';
@@ -45,24 +46,24 @@ const Map<String, String> _toolLabels = {
 };
 
 IconData _iconFor(String fn) {
-  if (fn.contains('note')) return Icons.sticky_note_2_outlined;
-  if (fn.contains('task')) return Icons.check_circle_outline;
+  if (fn.contains('note')) return LucideIcons.stickyNote;
+  if (fn.contains('task')) return LucideIcons.checkCircle2;
   if (fn.contains('event') || fn.contains('calendar')) {
-    return Icons.event_outlined;
+    return LucideIcons.calendarCheck;
   }
-  if (fn.contains('project')) return Icons.folder_outlined;
-  if (fn.contains('milestone')) return Icons.flag_outlined;
+  if (fn.contains('project')) return LucideIcons.folder;
+  if (fn.contains('milestone')) return LucideIcons.flag;
   if (fn.contains('web') || fn.contains('research') || fn.contains('article')) {
-    return Icons.public;
+    return LucideIcons.globe;
   }
-  if (fn.contains('image')) return Icons.image_outlined;
+  if (fn.contains('image')) return LucideIcons.image;
   if (fn.contains('person') || fn.contains('profile')) {
-    return Icons.person_outline;
+    return LucideIcons.user;
   }
-  if (fn.contains('place')) return Icons.place_outlined;
-  if (fn.contains('rag') || fn.contains('scope')) return Icons.tune;
-  if (fn.contains('calculate')) return Icons.calculate_outlined;
-  return Icons.auto_awesome;
+  if (fn.contains('place')) return LucideIcons.mapPin;
+  if (fn.contains('rag') || fn.contains('scope')) return LucideIcons.sliders;
+  if (fn.contains('calculate')) return LucideIcons.calculator;
+  return LucideIcons.sparkles;
 }
 
 /// Pull the destination route for this tool call from its `result` payload,
@@ -161,7 +162,7 @@ class ToolCallChip extends StatelessWidget {
           ),
           if (route != null) ...[
             const SizedBox(width: 4),
-            Icon(Icons.arrow_forward, size: 11, color: fg),
+            Icon(LucideIcons.arrowRight, size: 11, color: fg),
           ],
         ],
       ),

lib/widgets/voice_mic_button.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:lucide_icons/lucide_icons.dart';
 
 import '../providers/voice_provider.dart';
 
@@ -48,8 +49,8 @@ class VoiceMicButton extends StatelessWidget {
             color: iconColor,
           ),
         ),
-      VoiceMode.playing => Icon(Icons.volume_up, color: iconColor, size: 20),
-      _ => Icon(Icons.mic, color: iconColor, size: 20),
+      VoiceMode.playing => Icon(LucideIcons.volume2, color: iconColor, size: 20),
+      _ => Icon(LucideIcons.mic, color: iconColor, size: 20),
     };
   }