feat: add variant support to board editor

[tom-anders]

variant_editor.webm

[Copilot]

Pull request overview

Adds variant awareness to the board editor flow (controller + UI), and reuses a shared app bar title widget for variant display across screens.

Changes:

• Introduces BoardEditorControllerParams (variant + optional FEN) and threads it through BoardEditorScreen, filters, navigation, and tests.
• Adds variant switching UI to the board editor and updates “start position” behavior to use the selected variant’s initial position.
• Extracts a reusable VariantAppBarTitle widget and adopts it in Analysis and Board Editor app bars.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
lib/src/model/board_editor/board_editor_controller.dart	Provider family now keyed by (initialVariant, initialFen); stores variant in state; adds setVariant; updates PGN generation for variant.
lib/src/view/board_editor/board_editor_screen.dart	Wires params through the screen; adds variant title; adds variant picker action; adjusts start position + analysis launch variant handling.
lib/src/view/board_editor/board_editor_filters.dart	Updates filters sheet to take controller params instead of initial FEN.
lib/src/view/more/more_tab_screen.dart	Updates navigation to Board Editor to pass standard variant params.
lib/src/view/analysis/analysis_screen.dart	Replaces the local analysis title widget with VariantAppBarTitle.
lib/src/widgets/variant_app_bar_title.dart	New shared widget for app bar titles with variant icon handling.
test/view/board_editor/board_editor_screen_test.dart	Updates tests to use params and adds coverage for variant switching loading the starting position.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

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