fix(komodo_ui): use textTheme colors for dropdown text styling

[CharlVS]

Summary

Fixes dropdown text color visibility issues by using textTheme colors instead of colorScheme.onSurface. Some themes misuse onSurface as a background color, causing text to be invisible or hard to read in dropdown menus.

Changes

search_coin_select.dart

• Use theme.textTheme.bodyMedium instead of theme.listTileTheme.titleTextStyle for consistent text styling

searchable_select.dart

• Add fallback text color logic that uses textTheme.bodyLarge?.color with appropriate brightness fallback
• Update DefaultSelectedItemView to safely access text styles with null checks
• Update SelectItemWidget to use safe text style access
• Improve code formatting for better readability

Why

The colorScheme.onSurface property is intended to be the color that contrasts with the surface color. However, some custom themes incorrectly configure this value, leading to poor text visibility. Using textTheme colors provides a more reliable text color that respects the theme's intended design.

[Copilot]

Pull request overview

This PR addresses text visibility issues in dropdown components by updating the text color strategy. The core change implements a fallback mechanism that uses textTheme colors instead of relying on colorScheme.onSurface, which some themes incorrectly configure as a background color.

Key changes:

• Introduced text color fallback logic in _DropdownItemWidget using textTheme.bodyLarge?.color with brightness-based defaults
• Added null safety checks for text styles in DefaultSelectedItemView and SelectItemWidget
• Changed search_coin_select.dart to use textTheme.bodyMedium instead of listTileTheme.titleTextStyle

Note: While the PR improves null safety and introduces the new text color pattern in _DropdownItemWidget, the implementation is incomplete. Both DefaultSelectedItemView (line 305) and SelectItemWidget (line 754) still use theme.colorScheme.onSurface directly, which doesn't fully address the stated problem.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
searchable_select.dart	Adds text color fallback logic in _DropdownItemWidget, improves null safety in text style access, and reformats code for consistency
search_coin_select.dart	Changes coin name text styling from listTileTheme.titleTextStyle to textTheme.bodyMedium for consistency

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[Copilot]

The text color is still using theme.colorScheme.onSurface instead of the new approach with textTheme colors and brightness fallback. This is inconsistent with the changes in _DropdownItemWidget (lines 407-414) and doesn't fully address the stated problem of themes misusing onSurface as a background color.

[Copilot]

The text color is still using theme.colorScheme.onSurface instead of the new approach with textTheme colors and brightness fallback that was introduced in _DropdownItemWidget (lines 407-414). This is inconsistent and doesn't fully address the stated problem of themes misusing onSurface as a background color.

Suggested change

	style: textStyle.copyWith(color: theme.colorScheme.onSurface),
	style: textStyle.copyWith(
	color: textStyle.color ??
	(theme.brightness == Brightness.dark
	? Colors.white
	: Colors.black),
	),

[github-actions]

Visit the preview URL for this PR (updated for commit c90936b):

https://komodo-playground--pr303-fix-wallet-pr-onsurf-n5knox8t.web.app

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