[Shewart]

Release notes and version references for 0.4.0, the 0.4 stable release.

It fixes a hang in shellui add on .NET 8 and 9 apps that this release's smoke test found, and the 0.4.0 notes describe those fixes.

In this release (on main, plus #80)

• feat: add PromptSuggestions, Reasoning, ToolCall, Field and JsonViewer #76: PromptSuggestions, Reasoning, ToolCall, Field, JsonViewer
• feat: add a resizable panel group #77: a real resizable panel group (ResizablePanelGroup / Panel / Handle)
• feat: shellui migrate rewrites pages for template API changes #78: shellui migrate
• feat: .NET 8 support, shellui add all, shellui doctor, Sonner Clear; fix safelist #74: .NET 8 support, shellui add all, shellui doctor, SonnerService.Clear, destructive context menu items, safelist fix
• the whole 0.4 alpha line (alpha.1 to alpha.3), summed up for people upgrading from 0.3.6
• fix: CLI issues found testing the 0.4.0 release #80: add no longer hangs on .NET 8/9, the CLI rolls forward to newer runtimes, doctor stops calling a fresh app.css stale, list counts fixed

Not in it: #79 (ShellCharts instead of ApexCharts) stays a draft for a later release.

This PR

• Directory.Build.props: empty suffix, so both packages build as 0.4.0
• README, VERSIONING_STRATEGY, CLI_INSTALLATION, CLI_SYNTAX, FAQ, QUICKSTART and the version fallbacks move to 0.4.0. The latest stable was still listed as 0.3.5, so 0.3.6 is now the previous stable. Installs no longer need --version.
• docs/RELEASE_NOTES.md: the 0.4.0 section. scripts/extract-release-notes.sh 0.4.0 extracts it.

Release checks. Packed 0.4.0, with #80, installed from a local folder into a private tool path, using a throwaway NuGet cache so nothing local shadows the published packages.

• Release build: 0 warnings. 540 tests on net8.0 and net10.0 (542 with fix: CLI issues found testing the 0.4.0 release #80).
• Every command in a fresh .NET 10 app: init --yes, add all (244 files), list, remove, update, migrate --dry-run, theme apply, theme update, doctor. Builds 0/0.
• init and add all in fresh .NET 8 and .NET 9 apps build 0/0 and doctor is clean. Before fix: CLI issues found testing the 0.4.0 release #80, add all hung on both.
• All 98 direct targets together, including the dashboard-* and auth-* blocks, in my-app (.NET 10): 0/0, doctor clean.
• Upgrade from the published 0.4.0-alpha.3:
  • An app with a page using the old APIs builds on alpha.3.
  • 0.4.0 update rewrites 55 components and replaces the targets file, and the app builds 0/0.
  • migrate rewrites the page (DatePicker, TimePicker, Pagination), it builds 0/0, and doctor is clean.
• CLI templates in a browser:
  • suggestion chips; Reasoning folds to "Thought for 2 seconds"; Field shows the EditForm error; JSON tree folds
  • Resizable drags from 30/70 to 55/45
  • no console errors
• Packed ShellUI.Components in a .NET 8 app with shellui-all.css, in light and dark mode:
  • the new components render; the resizable drag and suggestion chips work
  • Dialog focus trap: Tab stays inside, Escape closes and returns focus
  • shellui.js loads through the package's JS initializer, with no console errors

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