fix(calendar): cap the all-day band so the timed grid stays visible

apps/mobile/__tests__/components/calendar-time-grid.test.tsx

@@ -114,6 +114,26 @@ describe("CalendarTimeGrid (mobile)", () => {
     expect(hostsByTestID(tree, "time-grid-col-header")).toHaveLength(4);
   });
 
+  it("caps the all-day stack and collapses the overflow into a +N that opens the day", () => {
+    const onSelectDay = vi.fn();
+    const col = column("2025-06-16");
+    const entries = Array.from({ length: 8 }, (_, i) =>
+      makeEntry({ habitId: `ad-${i}`, title: `All ${i}`, dueTime: null }),
+    );
+    const dayMap = new Map<string, CalendarDayEntry[]>([[col.dateStr, entries]]);
+    const tree = renderGrid([col], dayMap, onSelectDay);
+
+    expect(hostsByTestID(tree, "time-grid-all-day-event")).toHaveLength(4);
+    const more = hostsByTestID(tree, "time-grid-all-day-more");
+    expect(more).toHaveLength(1);
+    expect(textValuesWithin(tree, "time-grid-all-day-more")).toContain(4);
+
+    TestRenderer.act(() => {
+      more[0]!.props.onPress();
+    });
+    expect(onSelectDay).toHaveBeenCalledWith("2025-06-16");
+  });
+
   it("opens the tapped day from a column header", () => {
     const onSelectDay = vi.fn();
     const col = column("2025-06-16");

apps/mobile/app/(tabs)/calendar/_components/calendar-time-grid.tsx

@@ -27,8 +27,22 @@ const ALL_DAY_MIN_HEIGHT = 34;
 const ALL_DAY_CHIP_HEIGHT = 22;
 const ALL_DAY_GAP = 3;
 const ALL_DAY_PADDING = 12;
+const ALL_DAY_MAX_VISIBLE = 5;
 const HOURS = Array.from({ length: 24 }, (_, h) => h);
 
+/** Caps the all-day stack so a heavy day cannot push the timed grid off-screen:
+ *  the first chips show, the rest collapse into a single tappable "+N". */
+function splitAllDay(allDay: CalendarDayEntry[]): {
+  visible: CalendarDayEntry[];
+  overflow: number;
+} {
+  if (allDay.length <= ALL_DAY_MAX_VISIBLE) return { visible: allDay, overflow: 0 };
+  return {
+    visible: allDay.slice(0, ALL_DAY_MAX_VISIBLE - 1),
+    overflow: allDay.length - (ALL_DAY_MAX_VISIBLE - 1),
+  };
+}
+
 export interface TimeGridColumn {
   date: Date;
   dateStr: string;
@@ -255,6 +269,43 @@ function AllDayChip({
   );
 }
 
+function AllDayMoreChip({
+  count,
+  onPress,
+  tokens,
+}: Readonly<{ count: number; onPress: () => void; tokens: Tokens }>) {
+  return (
+    <Pressable
+      testID="time-grid-all-day-more"
+      accessibilityRole="button"
+      accessibilityLabel={`+${count}`}
+      onPress={onPress}
+      style={({ pressed }) => ({
+        flexDirection: "row",
+        alignItems: "center",
+        justifyContent: "center",
+        height: ALL_DAY_CHIP_HEIGHT - ALL_DAY_GAP,
+        paddingHorizontal: 6,
+        borderRadius: 6,
+        borderWidth: 1,
+        borderColor: tokens.hairline,
+        backgroundColor: pressed ? tokens.bgElev : "transparent",
+      })}
+    >
+      <Text
+        style={{
+          fontFamily: "Roboto_500Medium",
+          fontSize: 11,
+          color: tokens.fg3,
+          fontVariant: ["tabular-nums"],
+        }}
+      >
+        +{count}
+      </Text>
+    </Pressable>
+  );
+}
+
 function ColumnHeader({
   column,
   colWidth,
@@ -356,9 +407,10 @@ export function CalendarTimeGrid({
       0,
     );
     if (maxChips === 0) return ALL_DAY_MIN_HEIGHT;
+    const rows = Math.min(maxChips, ALL_DAY_MAX_VISIBLE);
     return Math.max(
       ALL_DAY_MIN_HEIGHT,
-      ALL_DAY_PADDING + maxChips * ALL_DAY_CHIP_HEIGHT,
+      ALL_DAY_PADDING + rows * ALL_DAY_CHIP_HEIGHT,
     );
   }, [perColumn]);
 
@@ -434,21 +486,31 @@ export function CalendarTimeGrid({
               </View>
 
               <View style={[styles.allDayRow, { height: allDayBandHeight }]}>
-                {perColumn.map(({ column, allDay }) => (
-                  <View
-                    key={column.dateStr}
-                    testID="time-grid-all-day"
-                    style={[styles.allDayCell, { width: colWidth }]}
-                  >
-                    {allDay.map((entry) => (
-                      <AllDayChip
-                        key={entry.habitId}
-                        entry={entry}
-                        tokens={tokens}
-                      />
-                    ))}
-                  </View>
-                ))}
+                {perColumn.map(({ column, allDay }) => {
+                  const { visible, overflow } = splitAllDay(allDay);
+                  return (
+                    <View
+                      key={column.dateStr}
+                      testID="time-grid-all-day"
+                      style={[styles.allDayCell, { width: colWidth }]}
+                    >
+                      {visible.map((entry) => (
+                        <AllDayChip
+                          key={entry.habitId}
+                          entry={entry}
+                          tokens={tokens}
+                        />
+                      ))}
+                      {overflow > 0 ? (
+                        <AllDayMoreChip
+                          count={overflow}
+                          onPress={() => onSelectDay(column.dateStr)}
+                          tokens={tokens}
+                        />
+                      ) : null}
+                    </View>
+                  );
+                })}
               </View>
 
               <ScrollView

apps/web/__tests__/components/calendar/calendar-time-grid.test.tsx

@@ -84,6 +84,23 @@ describe('CalendarTimeGrid', () => {
     expect(onSelectDay).toHaveBeenCalledWith('2025-06-16')
   })
 
+  it('caps the all-day stack and collapses the overflow into a +N that opens the day', () => {
+    const onSelectDay = vi.fn()
+    const col = column(2025, 5, 16)
+    const entries = Array.from({ length: 8 }, (_, i) =>
+      makeEntry({ habitId: `ad-${i}`, title: `All ${i}`, dueTime: null }),
+    )
+    const dayMap = new Map<string, CalendarDayEntry[]>([[col.dateStr, entries]])
+    renderGrid([col], dayMap, onSelectDay)
+
+    expect(screen.getAllByTestId('time-grid-all-day-event')).toHaveLength(4)
+    const more = screen.getByTestId('time-grid-all-day-more')
+    expect(more).toHaveTextContent('+4')
+
+    fireEvent.click(more)
+    expect(onSelectDay).toHaveBeenCalledWith('2025-06-16')
+  })
+
   it('gives the pinned all-day band an opaque backdrop so scrolled hours never bleed through', () => {
     const col = column(2025, 5, 16)
     renderGrid([col], new Map())

apps/web/components/calendar/calendar-time-grid.tsx

@@ -13,8 +13,22 @@ const MIN_COL_WIDTH = 80
 const HEADER_HEIGHT = 52
 const BODY_MAX_HEIGHT = 520
 const SCROLLER_MAX_HEIGHT = HEADER_HEIGHT + 40 + BODY_MAX_HEIGHT
+const ALL_DAY_MAX_VISIBLE = 5
 const HOURS = Array.from({ length: 24 }, (_, h) => h)
 
+/** Caps the all-day stack so a heavy day cannot push the timed grid off-screen:
+ *  the first chips show, the rest collapse into a single tappable "+N". */
+function splitAllDay(allDay: CalendarDayEntry[]): {
+  visible: CalendarDayEntry[]
+  overflow: number
+} {
+  if (allDay.length <= ALL_DAY_MAX_VISIBLE) return { visible: allDay, overflow: 0 }
+  return {
+    visible: allDay.slice(0, ALL_DAY_MAX_VISIBLE - 1),
+    overflow: allDay.length - (ALL_DAY_MAX_VISIBLE - 1),
+  }
+}
+
 const CARD_BG = 'var(--bg-card)'
 const pinnedPaneBackground = {
   backgroundColor: 'var(--bg)',
@@ -198,6 +212,41 @@ function AllDayChip({ entry }: Readonly<{ entry: CalendarDayEntry }>) {
   )
 }
 
+function AllDayMoreChip({
+  count,
+  onSelect,
+}: Readonly<{ count: number; onSelect: () => void }>) {
+  return (
+    <button
+      type="button"
+      data-testid="time-grid-all-day-more"
+      onClick={onSelect}
+      aria-label={`+${count}`}
+      className="flex items-center justify-center bg-transparent transition-[background-color] duration-[var(--dur-fast)] ease-[var(--ease-standard)] hover:bg-[var(--bg-elev)]"
+      style={{
+        appearance: 'none',
+        cursor: 'pointer',
+        padding: '3px 6px',
+        borderRadius: 6,
+        border: 0,
+        boxShadow: 'inset 0 0 0 1px var(--hairline)',
+      }}
+    >
+      <span
+        style={{
+          fontFamily: 'var(--font-mono)',
+          fontSize: 11,
+          fontWeight: 500,
+          color: 'var(--fg-3)',
+          fontVariantNumeric: 'tabular-nums',
+        }}
+      >
+        +{count}
+      </span>
+    </button>
+  )
+}
+
 /** Google-Calendar-style time grid: a day column per entry in `columns`, an
  *  untimed all-day band on top, and timed habits placed as blocks by dueTime.
  *  Day columns keep a readable minimum width and scroll horizontally — the left
@@ -345,25 +394,31 @@ export function CalendarTimeGrid({
                 {allDayLabel}
               </span>
             </div>
-            {perColumn.map(({ column, allDay }) => (
-              <div
-                key={column.dateStr}
-                data-testid="time-grid-all-day"
-                data-date={column.dateStr}
-                className="flex flex-col"
-                style={{
-                  gap: 3,
-                  minHeight: 34,
-                  padding: '6px 3px',
-                  borderLeft: '1px solid var(--hairline)',
-                  borderBottom: '1px solid var(--hairline)',
-                }}
-              >
-                {allDay.map((entry) => (
-                  <AllDayChip key={entry.habitId} entry={entry} />
-                ))}
-              </div>
-            ))}
+            {perColumn.map(({ column, allDay }) => {
+              const { visible, overflow } = splitAllDay(allDay)
+              return (
+                <div
+                  key={column.dateStr}
+                  data-testid="time-grid-all-day"
+                  data-date={column.dateStr}
+                  className="flex flex-col"
+                  style={{
+                    gap: 3,
+                    minHeight: 34,
+                    padding: '6px 3px',
+                    borderLeft: '1px solid var(--hairline)',
+                    borderBottom: '1px solid var(--hairline)',
+                  }}
+                >
+                  {visible.map((entry) => (
+                    <AllDayChip key={entry.habitId} entry={entry} />
+                  ))}
+                  {overflow > 0 && (
+                    <AllDayMoreChip count={overflow} onSelect={() => onSelectDay(column.dateStr)} />
+                  )}
+                </div>
+              )
+            })}
           </div>
 
           <div className="grid" style={{ gridTemplateColumns: gridTemplate, minWidth: gridMinWidth }}>