### Version
v4.0.0 (commit f0020448ca87329199de7cb12f2015ebc4a3e5e7)

### Where
shell/plugins/panels/monitor/Panel.qml — the "TEXT SIZE" slider in the Display bar widget.

### Steps to reproduce
1. Open the Display widget on the bar.
2. Drag the "TEXT SIZE" slider to a larger value (e.g. from 12px toward 16px).
3. Release the mouse button.

### Expected
The text size changes to the new value (shell base font + GTK text scaling).

### Actual
The slider snaps back to its previous position and the text size does not change.

### Root cause
`PanelSlider.onReleased` (PanelSlider.qml) resets `liveValue` back to the bound
`value` immediately after emitting the `released` signal:

    onReleased: function(mouse) {
      ...
      root.dragging = false
      root.released(root.liveValue)
      root.liveValue = root.value   // <-- resets before value has a chance to update
    }

For the brightness slider, `onMoved` calls `previewBrightness()`, which updates
the bound `root.brightnessPercent` synchronously, so `value` already reflects
the drag when this reset happens.

For the text-size slider, `onReleased` only calls `setTextSize()`, which shells
out to `omarchy-display-text-size` asynchronously and doesn't update
`textSizePreviewIndex`. So `value` (bound to `root.currentTextIndex()`) is still
the old index at the moment `liveValue` gets reset, causing the visible snap-back.

Keyboard adjustment (h/l via `adjustTextSize()`) doesn't have this problem
because it sets `textSizePreviewIndex` before calling `setTextSize()` — only the
mouse-drag path is missing that step.

### Suggested fix
In the text-size slider's `onReleased` handler, set `textSizePreviewIndex`
(and call `markReflowing()`) before invoking `setTextSize()`, mirroring
`adjustTextSize()`:

    onReleased: function(v) {
      var idx = Math.round(v)
      root.markReflowing()
      root.textSizePreviewIndex = idx
      root.setTextSize(root.textSizeStops[idx])
    }