feat(journal): replace briefing surface with journal; remove news/RSS

The backend retired /api/briefing/* and the RSS feature entirely. This
Flutter change mirrors what landed web-side: rename the briefing surface
to journal, repoint at /api/journal/*, and drop the news/RSS UI since
its endpoints no longer exist.

New (mirrors briefing structure with adapted shapes):
- lib/data/api/journal_api.dart — getToday, getDay, getDays, triggerPrep
- lib/data/models/journal_day.dart — {day_date, conversation, messages}
- lib/providers/journal_provider.dart — async notifier, sendReply, polling,
  silent refresh, regeneratePrep. Mirrors the briefing notifier 1:1
- lib/widgets/journal_prep_card.dart — adapted briefing_digest_card
- lib/screens/journal/journal_screen.dart — adapted briefing_screen,
  weather card preserved (rendered from msg_metadata.sections.weather
  on the daily-prep assistant message). News cards / RSS reactions /
  article-discuss removed
- lib/screens/journal/journal_history_screen.dart — past days picker
  pulls /api/journal/days, drills into /api/journal/day/<iso>

Wiring:
- Routes.briefing → Routes.journal (constants.dart)
- Routes.news removed
- briefingApiProvider → journalApiProvider (api_client_provider.dart)
- newsApiProvider removed
- app.dart: shell tab "Briefing" → "Journal"; News destination removed
  from nav rail, bottom nav, and the More sheet
- splash_screen.dart and login_screen.dart: redirect Routes.journal
  instead of Routes.briefing
- chat_api.dart: drop openArticleInChat (calls deleted /api/chat/from-article)
- settings_provider.dart: drop rssEnabled getter and rssEnabledProvider

Deleted:
- lib/screens/briefing/ (whole directory)
- lib/screens/news/ (whole directory)
- lib/data/api/briefing_api.dart, news_api.dart
- lib/data/models/briefing_conversation.dart, briefing_feed.dart, news_item.dart
- lib/providers/briefing_provider.dart, news_provider.dart
- lib/widgets/briefing_digest_card.dart, news_card.dart
- test cases for NewsItem and BriefingFeed in test/widget_test.dart

flutter analyze: 0 issues.

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

lib/widgets/journal_prep_card.dart

@@ -3,24 +3,25 @@ import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
 
 import '../data/models/message.dart';
 
-class BriefingDigestCard extends StatefulWidget {
-  /// The first assistant message from today's briefing, or null if none yet.
+class JournalPrepCard extends StatefulWidget {
+  /// The first assistant message from today's journal — the daily prep
+  /// (LLM-generated briefing-style opener), or null if not yet generated.
   final Message? message;
 
   /// Called when the user taps "Generate now".
   final VoidCallback? onGenerateNow;
 
-  const BriefingDigestCard({
+  const JournalPrepCard({
     super.key,
     required this.message,
     this.onGenerateNow,
   });
 
   @override
-  State<BriefingDigestCard> createState() => _BriefingDigestCardState();
+  State<JournalPrepCard> createState() => _JournalPrepCardState();
 }
 
-class _BriefingDigestCardState extends State<BriefingDigestCard> {
+class _JournalPrepCardState extends State<JournalPrepCard> {
   bool _expanded = false;
 
   @override
@@ -43,10 +44,9 @@ class _BriefingDigestCardState extends State<BriefingDigestCard> {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            // Header row
             Row(
               children: [
-                Icon(Icons.wb_sunny_outlined, size: 18, color: scheme.primary),
+                Icon(Icons.menu_book_outlined, size: 18, color: scheme.primary),
                 const SizedBox(width: 8),
                 Text(
                   _todayLabel(),
@@ -57,11 +57,9 @@ class _BriefingDigestCardState extends State<BriefingDigestCard> {
               ],
             ),
             const SizedBox(height: 10),
-
-            // Body
             if (widget.message == null) ...[
               Text(
-                'No briefing yet today.',
+                'No prep yet today.',
                 style: textTheme.bodyMedium?.copyWith(
                   color: scheme.onSurfaceVariant,
                 ),

lib/widgets/news_card.dart

@@ -1,234 +0,0 @@
-import 'package:flutter/material.dart';
-import 'package:url_launcher/url_launcher.dart';
-
-import '../data/models/news_item.dart';
-
-class RssItemMeta {
-  final int id;
-  final String title;
-  final String url;
-  final String source;
-  final String snippet;
-  final DateTime? publishedAt;
-
-  const RssItemMeta({
-    required this.id,
-    required this.title,
-    required this.url,
-    required this.source,
-    required this.snippet,
-    this.publishedAt,
-  });
-
-  factory RssItemMeta.fromJson(Map<String, dynamic> json) => RssItemMeta(
-        id: json['id'] as int,
-        title: json['title'] as String? ?? '',
-        url: json['url'] as String? ?? '',
-        source: json['source'] as String? ?? '',
-        snippet: json['snippet'] as String? ?? '',
-        publishedAt: json['published_at'] != null
-            ? DateTime.tryParse(json['published_at'] as String)
-            : null,
-      );
-
-  factory RssItemMeta.fromNewsItem(NewsItem item) => RssItemMeta(
-        id: item.id,
-        title: item.title,
-        url: item.url,
-        source: item.source,
-        snippet: item.snippet,
-        publishedAt: item.publishedAt,
-      );
-
-  String get relativeDate {
-    if (publishedAt == null) return '';
-    final diff = DateTime.now().difference(publishedAt!);
-    if (diff.inHours < 24) return '${diff.inHours}h ago';
-    if (diff.inHours < 48) return 'Yesterday';
-    return '${publishedAt!.month}/${publishedAt!.day}';
-  }
-}
-
-class NewsCard extends StatelessWidget {
-  final RssItemMeta item;
-  final String? reaction; // 'up' | 'down' | null
-  final void Function(int itemId, String reaction) onReaction;
-  final VoidCallback? onDiscuss;
-  final int snippetMaxLines;
-
-  const NewsCard({
-    super.key,
-    required this.item,
-    required this.reaction,
-    required this.onReaction,
-    this.onDiscuss,
-    this.snippetMaxLines = 2,
-  });
-
-  Future<void> _openUrl() async {
-    if (item.url.isEmpty) return;
-    final uri = Uri.tryParse(item.url);
-    if (uri != null && await canLaunchUrl(uri)) {
-      await launchUrl(uri, mode: LaunchMode.externalApplication);
-    }
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    final scheme = Theme.of(context).colorScheme;
-    final textTheme = Theme.of(context).textTheme;
-
-    return Card(
-      margin: const EdgeInsets.symmetric(vertical: 4),
-      elevation: 0,
-      shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(10),
-        side: BorderSide(color: scheme.outlineVariant),
-      ),
-      child: Padding(
-        padding: const EdgeInsets.fromLTRB(12, 10, 12, 10),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            // Source + date row
-            Row(
-              children: [
-                if (item.source.isNotEmpty)
-                  Text(
-                    item.source.toUpperCase(),
-                    style: textTheme.labelSmall?.copyWith(
-                      color: scheme.primary,
-                      fontWeight: FontWeight.w700,
-                      letterSpacing: 0.6,
-                    ),
-                  ),
-                if (item.source.isNotEmpty && item.relativeDate.isNotEmpty)
-                  Padding(
-                    padding: const EdgeInsets.only(left: 8),
-                    child: Text(
-                      item.relativeDate,
-                      style: textTheme.labelSmall?.copyWith(
-                        color: scheme.onSurfaceVariant,
-                      ),
-                    ),
-                  ),
-              ],
-            ),
-            const SizedBox(height: 4),
-            // Title — tappable if URL present. Text stays in onSurface for
-            // contrast; the primary-colored underline carries the "this is a
-            // link" signal without tanking readability.
-            GestureDetector(
-              onTap: item.url.isNotEmpty ? _openUrl : null,
-              child: Text(
-                item.title,
-                style: textTheme.titleSmall?.copyWith(
-                  fontWeight: FontWeight.w600,
-                  color: scheme.onSurface,
-                  height: 1.3,
-                  decoration: item.url.isNotEmpty ? TextDecoration.underline : null,
-                  decorationColor: scheme.primary.withValues(alpha: 0.7),
-                  decorationThickness: 1.5,
-                ),
-              ),
-            ),
-            // Snippet
-            if (item.snippet.isNotEmpty) ...[
-              const SizedBox(height: 4),
-              Text(
-                item.snippet,
-                maxLines: snippetMaxLines,
-                overflow: TextOverflow.ellipsis,
-                style: textTheme.bodySmall?.copyWith(
-                  color: scheme.onSurfaceVariant,
-                  height: 1.45,
-                ),
-              ),
-            ],
-            const SizedBox(height: 8),
-            // Actions row: reactions + discuss
-            Row(
-              children: [
-                _ReactionButton(
-                  emoji: '👍',
-                  active: reaction == 'up',
-                  onTap: () => onReaction(item.id, 'up'),
-                ),
-                const SizedBox(width: 6),
-                _ReactionButton(
-                  emoji: '👎',
-                  active: reaction == 'down',
-                  onTap: () => onReaction(item.id, 'down'),
-                ),
-                if (onDiscuss != null) ...[
-                  const Spacer(),
-                  _DiscussButton(onTap: onDiscuss!),
-                ],
-              ],
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
-
-class _DiscussButton extends StatelessWidget {
-  final VoidCallback onTap;
-  const _DiscussButton({required this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    final scheme = Theme.of(context).colorScheme;
-    return GestureDetector(
-      onTap: onTap,
-      child: Container(
-        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 3),
-        decoration: BoxDecoration(
-          border: Border.all(color: scheme.primary.withValues(alpha: 0.5)),
-          borderRadius: BorderRadius.circular(6),
-        ),
-        child: Text(
-          'Discuss',
-          style: TextStyle(
-            fontSize: 12,
-            fontWeight: FontWeight.w600,
-            color: scheme.primary,
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class _ReactionButton extends StatelessWidget {
-  final String emoji;
-  final bool active;
-  final VoidCallback onTap;
-
-  const _ReactionButton({
-    required this.emoji,
-    required this.active,
-    required this.onTap,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    final scheme = Theme.of(context).colorScheme;
-    return GestureDetector(
-      onTap: onTap,
-      child: AnimatedContainer(
-        duration: const Duration(milliseconds: 150),
-        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
-        decoration: BoxDecoration(
-          color: active ? scheme.primary.withValues(alpha: 0.12) : Colors.transparent,
-          border: Border.all(
-            color: active ? scheme.primary : scheme.outlineVariant,
-          ),
-          borderRadius: BorderRadius.circular(6),
-        ),
-        child: Text(emoji, style: const TextStyle(fontSize: 14)),
-      ),
-    );
-  }
-}