feat(core,app,android,ios): rename a share

ShareStore::rename changes only the name; the id that the catalog, watch
state and offline files are keyed by stays the same. Sync carries the
change as it does any other change to the share's register. The desktop
renames in the share's row. The phones rename from the share's menu.
Before, the name given at add time was permanent short of removing the
share.

ios/ProtonStream/UI/SharesView.swift

@@ -13,6 +13,7 @@ struct SharesView: View {
     @State private var browsing = false
     @State private var repairing: ShareRecord?
     @State private var removing: ShareRecord?
+    @State private var renaming: ShareRecord?
 
     var body: some View {
         TabPage("Shares") {
@@ -34,6 +35,7 @@ struct SharesView: View {
                                     share: share,
                                     onRefresh: { model.refreshShare(share.id) },
                                     onRepair: { repairing = share },
+                                    onRename: { renaming = share },
                                     onRemove: { removing = share }
                                 )
                             }
@@ -78,6 +80,9 @@ struct SharesView: View {
         .fullScreenCover(isPresented: $browsing) {
             DriveBrowser()
         }
+        .sheet(item: $renaming) { share in
+            RenameShareSheet(share: share) { model.renameShare(id: share.id, name: $0) }
+        }
         .sheet(item: $repairing) { share in
             RepairShareSheet(share: share) { url, password in
                 model.repairShare(id: share.id, url: url, password: password)
@@ -124,6 +129,7 @@ private struct ShareRow: View {
     let share: ShareRecord
     let onRefresh: () -> Void
     let onRepair: () -> Void
+    let onRename: () -> Void
     let onRemove: () -> Void
     @Environment(\.scheme) private var scheme
 
@@ -147,6 +153,7 @@ private struct ShareRow: View {
                 // One share, not the library: a link that has just had files
                 // added should not cost a walk of every other one.
                 Button(action: onRefresh) { Label("Refresh", systemImage: "arrow.clockwise") }
+                Button(action: onRename) { Label("Rename", systemImage: "pencil") }
                 // Not a remove: a share whose secret has become unreadable
                 // cannot be removed either.
                 if !share.fromAccount {
@@ -165,6 +172,34 @@ private struct ShareRow: View {
     }
 }
 
+/// A new name for a share. The library, history and downloads stay.
+private struct RenameShareSheet: View {
+    let share: ShareRecord
+    let onRename: (String) -> Void
+    @Environment(\.dismiss) private var dismiss
+    @State private var name: String
+
+    init(share: ShareRecord, onRename: @escaping (String) -> Void) {
+        self.share = share
+        self.onRename = onRename
+        _name = State(initialValue: share.name)
+    }
+
+    var body: some View {
+        DialogSheet("Rename \(share.name)") {
+            Field(label: "Name", text: $name)
+        } buttons: {
+            Button("Cancel") { dismiss() }.buttonStyle(.tonal)
+            Button("Save") {
+                onRename(name.trimmingCharacters(in: .whitespaces))
+                dismiss()
+            }
+            .buttonStyle(.accent)
+            .disabled(name.trimmingCharacters(in: .whitespaces).isEmpty)
+        }
+    }
+}
+
 /// Re-enter the link for a share the app can no longer decrypt its secret for.
 ///
 /// It has to be the *same* link — a different token is a different share.