Prepares the v0.5.0 release by adding release notes and updating documentation to reflect new components and fixes shipped in this version.

Release Notes (release-notes/v0.5.0.md)

• Documents all 8 milestone items across 3 issues and 6 PRs
• FlexBox — CSS flexbox layout (Direction, Justify, Align, Wrap, Gap, Width, Height) via FlexBoxRenderable + FlexBoxElementTranslator
• ViewHeightScrollable — line-by-line viewport scrolling over arbitrary RenderFragment content; embedded scrollbar support for Panel/Border/Table; backed by new ScrollableLayoutCoordinator singleton; refactored ScrollableWithBarRenderable → ScrollableRenderable
• Table column extensions — Width, Padding, NoWrap attributes matching Spectre.Console's native TableColumn API
• Focus @key fix — FocusManager.FocusAsync now correctly resolves targets identified by @key on conditionally-rendered components; root cause was key population happening too late in the render pipeline
• CI: macOS ARM64 — macos-latest added to build-test matrix

README

• Component count: 20+ → 25+
• Layout category: 6 → 8 components (FlexBox, ViewHeightScrollable added)
• Both new components added to the full alphabetical reference list

design-doc/builtin-components.md

• Catalog header updated
• Full parameter tables added for FlexBox and ViewHeightScrollable (including ScrollContext members)

• Fixes Release 0.5.0 #313

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