fix(chart): weekly chart shows duplicate line due to repeated weekday labels

InputMetrics/InputMetrics/Models/DailySummary.swift

@@ -52,4 +52,24 @@ struct DailySummary: Codable, FetchableRecord, PersistableRecord {
         static let peakMouseSpeed = Column(CodingKeys.peakMouseSpeed)
         static let peakWPM = Column(CodingKeys.peakWPM)
     }
+
+    static func zero(for date: String) -> DailySummary {
+        DailySummary(date: date, mouseDistancePx: 0, mouseClicksLeft: 0, mouseClicksRight: 0, mouseClicksMiddle: 0, keystrokes: 0, scrollDistanceVertical: 0, scrollDistanceHorizontal: 0)
+    }
+}
+
+extension [DailySummary] {
+    func fillingMissingDays(from start: Date, to end: Date) -> [DailySummary] {
+        let calendar = Calendar.current
+        let formatter = DateHelper.self
+        let existing = Dictionary(uniqueKeysWithValues: self.map { ($0.date, $0) })
+        var result: [DailySummary] = []
+        var current = start
+        while current <= end {
+            let key = formatter.string(from: current)
+            result.append(existing[key] ?? .zero(for: key))
+            current = calendar.date(byAdding: .day, value: 1, to: current) ?? current
+        }
+        return result
+    }
 }

InputMetrics/InputMetrics/ViewModels/KeyboardStatsViewModel.swift

@@ -86,6 +86,10 @@ final class KeyboardStatsViewModel {
             }
         }
 
+        if selectedRange == .week || selectedRange == .month {
+            chartData = chartData.fillingMissingDays(from: startDate, to: selectedDate)
+        }
+
         if selectedRange == .year {
             chartData = aggregateByWeek(chartData)
         }

InputMetrics/InputMetrics/ViewModels/MouseStatsViewModel.swift

@@ -81,6 +81,10 @@ final class MouseStatsViewModel {
             }
         }
 
+        if selectedRange == .week || selectedRange == .month {
+            chartData = chartData.fillingMissingDays(from: startDate, to: selectedDate)
+        }
+
         if selectedRange == .year {
             chartData = aggregateByWeek(chartData)
         }

InputMetrics/InputMetrics/Views/ChartView.swift

@@ -26,32 +26,31 @@ struct ChartView: View {
                     .frame(maxWidth: .infinity, maxHeight: .infinity)
             } else {
                 Chart(data, id: \.date) { item in
-                    let label = formatLabel(from: item.date)
                     let value = metricValue(for: item)
 
-                    LineMark(
-                        x: .value("Date", label),
+                    AreaMark(
+                        x: .value("Date", item.date),
                         y: .value("Value", value)
                     )
-                    .foregroundStyle(Color.blue)
+                    .foregroundStyle(Color.blue.opacity(0.15))
                     .interpolationMethod(.catmullRom)
 
-                    AreaMark(
-                        x: .value("Date", label),
+                    LineMark(
+                        x: .value("Date", item.date),
                         y: .value("Value", value)
                     )
-                    .foregroundStyle(Color.blue.opacity(0.1))
+                    .foregroundStyle(Color.blue)
                     .interpolationMethod(.catmullRom)
 
                     PointMark(
-                        x: .value("Date", label),
+                        x: .value("Date", item.date),
                         y: .value("Value", value)
                     )
                     .foregroundStyle(Color.blue)
                     .symbolSize(30)
 
-                    if hoveredLabel == label {
-                        RuleMark(x: .value("Date", label))
+                    if hoveredLabel == item.date {
+                        RuleMark(x: .value("Date", item.date))
                             .foregroundStyle(Color.secondary.opacity(0.3))
                             .annotation(position: .top, spacing: 4) {
                                 Text(formattedTooltip(value: value))
@@ -63,6 +62,18 @@ struct ChartView: View {
                             }
                     }
                 }
+                .chartLegend(.hidden)
+                .chartXAxis {
+                    AxisMarks { value in
+                        AxisValueLabel {
+                            if let dateStr = value.as(String.self) {
+                                Text(formatLabel(from: dateStr))
+                            }
+                        }
+                        AxisGridLine()
+                        AxisTick()
+                    }
+                }
                 .accessibilityElement(children: .ignore)
                 .accessibilityLabel("\(chartTitle) chart for \(range == .week ? "this week" : range == .month ? "this month" : "this year")")
                 .chartYAxisLabel(yAxisLabel)