Add lead workflows, PDF signing, AR projects and photo gallery integration

GasTankAR/Views/Leads/Overview/LeadCardGrid.swift

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+import SwiftUI
+
+/// All card positions are calculated in the same transaction as the bookmark flight.
+struct LeadCardGrid: Layout {
+    let columnCount: Int
+    var spacing: CGFloat = 16
+
+    func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
+        let width = proposal.width ?? 310
+        let frames = frames(width: width, subviews: subviews)
+        return CGSize(width: width, height: frames.map(\.maxY).max() ?? 0)
+    }
+
+    func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize,
+                       subviews: Subviews, cache: inout ()) {
+        let frames = frames(width: bounds.width, subviews: subviews)
+        for (index, subview) in subviews.enumerated() {
+            let frame = frames[index]
+            subview.place(at: CGPoint(x: bounds.minX + frame.minX, y: bounds.minY + frame.minY),
+                          anchor: .topLeading,
+                          proposal: ProposedViewSize(width: frame.width, height: frame.height))
+        }
+    }
+
+    private func frames(width: CGFloat, subviews: Subviews) -> [CGRect] {
+        let columns = max(1, columnCount)
+        let cardWidth = max(0, (width - CGFloat(columns - 1) * spacing) / CGFloat(columns))
+        var frames: [CGRect] = []
+        var rowY: CGFloat = 0
+        var rowHeight: CGFloat = 0
+        for (index, subview) in subviews.enumerated() {
+            let column = index % columns
+            if column == 0 && index > 0 {
+                rowY += rowHeight + spacing
+                rowHeight = 0
+            }
+            let size = subview.sizeThatFits(ProposedViewSize(width: cardWidth, height: nil))
+            frames.append(CGRect(x: CGFloat(column) * (cardWidth + spacing), y: rowY,
+                                 width: cardWidth, height: size.height))
+            rowHeight = max(rowHeight, size.height)
+        }
+        return frames
+    }
+}