Fix AppBar Text coloring

[TheAxelander]

No description provided.

[Copilot]

Pull request overview

This PR fixes text and icon coloring in the AppBar to ensure proper contrast and consistency across theme modes by changing from Color.Surface to Color.Inherit.

Key changes:

• Changed icon color from Color.Surface to Color.Inherit for three separator icons in the AppBar
• Converted HTML <a> tag to MudBlazor <MudLink> component with Color.Inherit for the Change Log link
• Updated release date in CHANGELOG.md from "2025-xx-xx" to "2025-12-17"

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
OpenBudgeteer.Blazor/Shared/MainLayout.razor	Updated AppBar separator icons and Change Log link to use Color.Inherit instead of Color.Surface, ensuring proper color inheritance from the AppBar component
CHANGELOG.md	Updated version 1.11 release date to 2025-12-17

The changes are consistent with the existing AppBar styling patterns where other interactive elements (MudIconButton components) already use Color.Inherit. The use of Color.Inherit is appropriate for AppBar elements as it ensures they inherit the proper text color from the AppBar theme, providing correct contrast in both light and dark modes.

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