fix(island): review findings in the controls panel

Edit mode let a right-click and the wheel through to the tile, so a
right-click opened the drawer and scroll changed volume, against the
spec. The drag area now takes both buttons and the wheel.

A scroll up on a level already above the cap, such as a mic set to 120%
elsewhere, snapped it down to the cap. The cap now only stops a step up.

Prefs logs a failed write, which printErrors off had silenced: the new
order would otherwise vanish at the next restart with no trace. Its
parsed object is renamed from data to doc, so it cannot shadow a base
property of that name.

The spec now says what was built: JSON.parse rather than a JsonAdapter,
and the helper list as it is.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/desktop/Prefs.qml b/desktop/Prefs.qml
index dd2fdfc..d56b34c 100644
--- a/desktop/Prefs.qml
+++ b/desktop/Prefs.qml
@@ -34,12 +34,12 @@ Singleton {
 
     // The whole parsed object, so a write keeps keys this version does not
     // know about.
-    property var data: ({})
+    property var doc: ({})
 
     function setControls(list) {
         root.controls = Controls.normalize(list);
-        const out = Object.assign({}, root.data, { controls: root.controls });
-        root.data = out;
+        const out = Object.assign({}, root.doc, { controls: root.controls });
+        root.doc = out;
         file.setText(JSON.stringify(out, null, 2) + "\n");
     }
 
@@ -49,7 +49,7 @@ Singleton {
             const v = JSON.parse(file.text());
             if (v && typeof v === "object" && !Array.isArray(v)) parsed = v;
         } catch (e) {}
-        root.data = parsed;
+        root.doc = parsed;
         const next = "controls" in parsed ? Controls.normalize(parsed.controls) : Controls.defaults();
         // The watch also fires on our own write; compare so it is a no-op.
         if (JSON.stringify(next) !== JSON.stringify(root.controls)) root.controls = next;
@@ -61,9 +61,12 @@ Singleton {
         atomicWrites: true
         watchChanges: true
         printErrors: false
+        // printErrors is off for the missing-file read; a failed write still
+        // has to be heard, or the new order silently vanishes at restart.
+        onSaveFailed: error => console.warn("Prefs: writing", root.path, "failed:", error)
         onFileChanged: reload()
         onLoaded: root.reparse()
         // Missing file: the defaults, and nothing written.
-        onLoadFailed: { root.data = {}; root.controls = Controls.defaults(); }
+        onLoadFailed: { root.doc = {}; root.controls = Controls.defaults(); }
     }
 }