fix(qt): modal forms open clean, never with the last session's text

QbzLineEdit re-seeds its box only when `text` CHANGES and only while the
box is not focused; QbzTextArea only while unfocused. Modals that reset
their drafts on the close edge (the box still holds focus for that
frame) or reopen with the seed they closed on produced neither, so the
box kept the previous input while the draft said otherwise. Both
controls gain `reset(value)`, which writes the box directly, and every
modal form calls it from its open handler: playlist edit and create,
MyQBZ create / rename / description, folder create and edit, the link
resolver, the rip wizard and the library folder editor. The MyQBZ
create name now resets on the open edge, and its edit panel re-seeds on
every open, also for the same collection.

Renaming a Qobuz playlist also patches the playlist manager's warm cache,
which the editor seeds from before any fetch: reopening the editor right
after Save showed the pre-save name until the background reload landed,
and forever while offline.

cc

crates/qbz-qt/qml/controls/MyQbzModals.qml

@@ -76,10 +76,19 @@ Item {
         property string name: ""
         readonly property bool canCreate: createPanel.name !== "" && !createPanel.creating
 
-        // A fresh open starts with an empty field.
+        // A fresh open starts with an empty field — reset on the OPEN edge,
+        // never the close edge: at close the box still holds focus for a
+        // frame, its focus-gated re-seed skips, and the next open found the
+        // draft already "" with the old text still in the box (the
+        // dirty-form report of 2026-09-14). `reset()` syncs the box itself.
         Connections {
             target: root
-            function onCreateOpenChanged() { createPanel.name = "" }
+            function onCreateOpenChanged() {
+                if (!root.createOpen)
+                    return
+                createPanel.name = ""
+                createNameField.reset("")
+            }
         }
 
         Rectangle {
@@ -166,6 +175,7 @@ Item {
                         font.letterSpacing: 1.5
                     }
                     QbzLineEdit {
+                        id: createNameField
                         width: parent.width
                         height: 34
                         text: createPanel.name
@@ -255,10 +265,17 @@ Item {
         // frame, and then `open` never changes and the prefill would be stale.
         // Keying it on the whole document instead would clobber what the user
         // is typing every time an unrelated field (`busy`) flips.
-        readonly property string editKey: editPanel.mode + "|" + (root.editDoc.name || "")
+        // The open flag rides along so a reopen on the SAME collection
+        // re-seeds too (a cancelled rename left its draft behind).
+        readonly property string editKey: (root.editOpen ? "1" : "0") + "|"
+            + editPanel.mode + "|" + (root.editDoc.name || "")
         onEditKeyChanged: {
             editPanel.draftName = root.editDoc.name || ""
             editPanel.draftDescription = root.editDoc.description || ""
+            if (root.editOpen) {
+                renameField.reset()
+                descriptionField.reset()
+            }
         }
 
         Rectangle {
@@ -338,6 +355,7 @@ Item {
 
                 // --- Body: rename
                 QbzLineEdit {
+                    id: renameField
                     visible: editPanel.isRename
                     width: parent.width
                     height: visible ? 34 : 0
@@ -350,6 +368,7 @@ Item {
 
                 // --- Body: description
                 QbzTextArea {
+                    id: descriptionField
                     visible: editPanel.isDescription
                     width: parent.width
                     // A FLAT 96, never `visible ? 96 : 0`: a Column does not