Polish dashboard: consistent icon set, flatter cards, merged activity card

Replace card-header emoji with a matching stroke-style SVG icon set that
inherits theme color via currentColor. Drop the accent-stripe border from
every card and keep it only on the Your Courses card, the one primary
action. Merge Continue Watching and Recently Viewed into a single
true-recency list so an old completed item can no longer outrank a newer
in-progress one across two separately-capped lists.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

offlineu_core.py

@@ -1790,23 +1790,6 @@ def build_study_guide_markdown(course: Course) -> str:
 current_course = None
 
 
-def _split_continue_watching(all_views: List[Dict[str, Any]]) -> Tuple[List[Dict[str, Any]], List[Dict[str, Any]]]:
-    """
-    Split the recent-views list (already carrying percent_watched/completed,
-    see get_recent_views_for_display) into 'Continue Watching' - genuinely
-    in-progress lessons - and the remaining 'Recently Viewed' entries, each
-    capped at 5 for the dashboard. Reuses the same underlying history rather
-    than a separate library-wide progress index (see plan notes).
-    """
-    continue_watching = [v for v in all_views if 0 < v['percent_watched'] < 100][:5]
-    continue_ids = {(v.get('course_path'), v.get('lesson_path')) for v in continue_watching}
-    recent_views = [
-        v for v in all_views
-        if (v.get('course_path'), v.get('lesson_path')) not in continue_ids
-    ][:5]
-    return continue_watching, recent_views
-
-
 def format_duration(seconds: int) -> str:
     """Render a duration in seconds as e.g. '3h 24m' or '45m' (under an hour)."""
     total_minutes = max(0, int(seconds)) // 60
@@ -1819,7 +1802,7 @@ def index():
     """Main dashboard"""
     global current_course
 
-    continue_watching, recent_views = _split_continue_watching(get_recent_views_for_display())
+    recent_views = get_recent_views_for_display()[:8]
 
     if current_course is None:
         # One scan covers stats/stale-courses/heatmap - see _scan_library_activity.
@@ -1827,7 +1810,6 @@ def index():
         return render_template('course_dashboard.html',
                                course=None,
                                stats={'total_lessons': 0, 'completed_lessons': 0, 'completion_percentage': 0},
-                               continue_watching=continue_watching,
                                recent_views=recent_views,
                                recently_added=get_recently_added_courses(),
                                library_stats=format_library_stats(scan),
@@ -1851,7 +1833,6 @@ def index():
     return render_template('course_dashboard.html',
                            course=current_course,
                            stats=stats,
-                           continue_watching=continue_watching,
                            recent_views=recent_views,
                            has_note=bool(course_has_any_notes(current_course)),
                            is_queued=os.path.abspath(current_course.path) in get_next_up_paths(),