phranck 0bde1d9f4d Refactor: remove block/flat appearances, ascii border style, and update documentation ...

Remove the block and flat appearance systems entirely, keeping only the
four standard border-based appearances (line, rounded, doubleLine, heavy).
Remove BorderStyle.ascii preset. Clean up all stale references in doc
comments, DocC articles, and README.

- Remove Appearance.flat/.block and BlockPalette protocol
- Remove surface color tokens (surfaceBackground, surfaceHeaderBackground, elevatedBackground)
- Remove BorderStyle.block, .ascii, and related statics
- Remove flat/block rendering paths from all views
- Simplify BorderRenderer, BorderModifier, ContainerView, Menu, Button, StatusBar, AppHeader
- Fix BorderStyle doc examples (add missing right padding)
- Update DocC: PaletteReference, ThemingGuide, AppearanceAndColors, RenderCycle, TUIkit.md
- Update README palette references to SystemPalette
- Delete FlatThemePage from example app
- Remove related tests (526 tests / 84 suites passing)

2026-02-05 22:08:53 +01:00

..

TUIkit

Refactor: remove block/flat appearances, ascii border style, and update documentation

2026-02-05 22:08:53 +01:00

TUIkitExample

Refactor: remove block/flat appearances, ascii border style, and update documentation

2026-02-05 22:08:53 +01:00