Calendar: independent week scrolling and weekend colors

- calendar_scroll replaced by per-week calendar_scrolls[4] + active_week
- Tab cycles through weeks within Calendar, Left/Right switch week
- Up/Down scroll only the active week independently
- Sat/Sun rendered in Magenta, weekdays in Cyan, today in Yellow

src/ui/components.rs

@@ -602,7 +602,8 @@ pub fn render_calendar_panel(
     area: Rect,
     events: &[CalendarEvent],
     focused: bool,
-    _scroll: u16,
+    scrolls: &[u16; 4],
+    active_week: usize,
 ) {
     if area.width < 20 || area.height < 3 {
         return;
@@ -629,7 +630,7 @@ pub fn render_calendar_panel(
         let week_title = format!(" W/C {} ", week_start.format("%d/%m"));
         let col_area = cols[week_idx];
 
-        let border = if focused { FOCUS_COLOR } else { Color::DarkGray };
+        let border = if focused && week_idx == active_week { FOCUS_COLOR } else { Color::DarkGray };
         let block = Block::default()
             .borders(Borders::ALL)
             .border_style(Style::default().fg(border))
@@ -651,9 +652,6 @@ pub fn render_calendar_panel(
             continue;
         }
 
-        let inner = block.inner(col_area);
-        let inner_h = inner.height as usize;
-
         let mut lines: Vec<Line> = Vec::new();
 
         for day_offset in 0..7 {
@@ -661,6 +659,8 @@ pub fn render_calendar_panel(
 
             let day_style = if day == today {
                 Style::default().fg(Color::Yellow).add_modifier(Modifier::BOLD)
+            } else if matches!(day.weekday(), chrono::Weekday::Sat | chrono::Weekday::Sun) {
+                Style::default().fg(Color::Magenta).add_modifier(Modifier::BOLD)
             } else {
                 Style::default().fg(Color::Cyan).add_modifier(Modifier::BOLD)
             };
@@ -679,10 +679,6 @@ pub fn render_calendar_panel(
             );
             lines.push(Line::from(Span::styled(day_label, day_style)));
 
-            if lines.len() >= inner_h {
-                break;
-            }
-
             for event in events.iter().filter(|e| e.start.map_or(false, |s| s.date() == day)) {
                 let time_str = event.start.map(|s| s.format("%H:%M").to_string()).unwrap_or_default();
                 let line_text = format!("  {} {}", time_str, event.summary);
@@ -690,14 +686,12 @@ pub fn render_calendar_panel(
                     line_text,
                     Style::default().fg(DETAIL_COLOR),
                 )));
-
-                if lines.len() >= inner_h {
-                    break;
-                }
             }
         }
 
-        let paragraph = Paragraph::new(Text::from(lines)).block(block);
+        let paragraph = Paragraph::new(Text::from(lines))
+            .block(block)
+            .scroll((scrolls[week_idx], 0));
         frame.render_widget(paragraph, col_area);
     }
 }