Agenda SwiftUI Screen

Swipe to page between weeks; the strip settles with a soft haptic, the month header cross-fades, and the selection keeps its weekday in the new week. Tap a day and the pill glides to it with matchedGeometryEffect. Hold, then drag across days to scrub the selection with a tick per day. Drag down and the week row grows into its month grid while the other rows fade in around it; drag up to collapse back onto the selected week. Today is ringed in the tint, and events puts up to three dots under a day.

Notes

• States: week, expanding (fractional progress while dragging), month. In month mode paging moves by month and leaves the selection alone.
• Every pane is the same six-row month grid clipped to rowHeight * (1 + 5 * progress) and offset so the focused week stays at the top, which is what makes expand and collapse continuous instead of a swap.
• Paging is a custom three-pane carousel rather than a ScrollView, so the horizontal page, the vertical expand and the hold-to-scrub can share one surface without fighting the scroll view. A drag is classified by its first movement; predictedEndTranslation commits flicks, and the carousel re-centers without animation after each page.
• Haptics: selection on every selection change (tap or scrub), soft impact on page settle.
• Days are labeled buttons with Today and event counts as their value; the strip exposes Next, Previous and Show month/week actions. Reduce Motion shortens the pill glide and paging to short ease-outs.
• CalendarStripExample at the end of CalendarStrip.swift is the screen shown in the preview; copy it as a starting point.