Projects tab: create via +, sort by activity/name/count

Declared-but-empty projects persist locally (UserDefaults) until a
note carries the name, at which point the project syncs via notes as
usual. Empty declared projects can be swipe-deleted.

Claude-Session: https://claude.ai/code/session_014esDWi42URLEC6Cj17hGQ3

Notes/Views/Projects/ProjectsPrefs.swift

@@ -0,0 +1,38 @@
+import SwiftUI
+
+/// Device-local Projects-tab preferences: the sort order and the names the
+/// user has declared via "+" before any note was filed into them. Declared
+/// names are deliberately NOT synced — a project becomes part of the synced
+/// data the moment a note carries it; until then it is scaffolding that only
+/// this device knows about.
+enum ProjectsPrefs {
+    static let declaredKey = "declaredProjects"
+    static let sortKey = "projectsSort"
+
+    /// Newline-joined storage — names are single-line (the creation alert's
+    /// text field can't produce newlines) so this stays trivially inspectable.
+    static func decodeDeclared(_ raw: String) -> [String] {
+        raw.split(separator: "\n").map(String.init)
+    }
+
+    static func encodeDeclared(_ names: [String]) -> String {
+        names.joined(separator: "\n")
+    }
+}
+
+/// Sort orders for the project list.
+enum ProjectsSort: String, CaseIterable, Identifiable {
+    case activity
+    case name
+    case count
+
+    var id: String { rawValue }
+
+    var label: String {
+        switch self {
+        case .activity: "Recent Activity"
+        case .name: "Name"
+        case .count: "Note Count"
+        }
+    }
+}