ui: P2 leftovers (TreeLoadError, semantics, SDUI dropdown, dialog Material) - #516
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…alog Material (#514) Make tree load errors show a consistent icon/title (including SDUI), mark expand rows with button/expanded semantics, render SDUI selects via QueryaDropdown, and host dialog shells on Material popover cards.
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Material injects ThemeData.textTheme and bloated Extension Manager chrome enough to overflow the Marketplace tab; re-apply the ambient DefaultTextStyle/IconTheme after Material.
This was referenced Jul 28, 2026
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Summary
TreeLoadErrordefaults to icon + title; connection trees and SDUI expand errors use itSemantics(button, expanded)QueryaDropdowninstead ofDropdownButtonFormFieldQueryaDialogCard(Material+ popover) for dialog shells (ListTile assert safety)Closes #514
Test plan
TreeLoadErrorflutter test test/shared/widgets/tree_load_error_test.dart test/core/sdui/sdui_builders_test.dart