fix: update dropdown trigger label on select

[Branc0]

Summary

When a user selects an option from a toolbar dropdown, handleSelect updates selectedValue and emits the command, but does not update the reactive item.label used by ToolbarButton in the dropdown trigger. The visible label could stay on the initial value even though the selection changed.

dropdown.bug.mov

Steps to reproduce

• Open the editor with a mobile viewport (under 768px width) and open the overflow menu.
• Click on the font size dropdown and change the value.
• The document font-size changes, but the select remains displaying the same value

Solution

This change sets item.label from option.label when there's a change in the selection, keeping the trigger text in sync with the selection.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid setting labels on dropdowns that are meant to stay icon-only

handleSelect now assigns item.label.value for every option that has a label. That fixes font-family/font-size, but it also changes the lineHeight dropdown, which is configured as an icon-only control with no initial label in packages/super-editor/src/components/toolbar/defaultItems.js:1019-1043; its state sync in super-toolbar.js:996-1001 only updates selectedValue, so the new label will stick even after the caret moves elsewhere. Because ToolbarButton.vue:118-120 renders any truthy label, selecting a line height will start showing text like 1.50 in the trigger and widen the control unexpectedly.

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