[Shewart]

Release notes and version references for 0.4.0-alpha.3. The first release published with NuGet Trusted Publishing (#71).

In this release (already on main)

• fix: let a component's Class override its own conflicting classes #69: a component's Class overrides its own conflicting classes (Shell.Cn merges like tailwind-merge)
• fix: trap focus inside Dialog, AlertDialog, Sheet and Drawer #64: Dialog, AlertDialog, Sheet and Drawer keep keyboard focus inside and return it on close
• fix: never downgrade a package the project already references #70: add never downgrades a NuGet package the project already references
• fix: Razor class library support in init and docs; ci: NuGet Trusted Publishing #71: init supports Razor class libraries, plus a guide; release workflow on Trusted Publishing
• fix: reconcile package and CLI template drift (batch 1) #63, fix: reconcile package and CLI template drift (batch 2) #65, fix: reconcile package and CLI template drift (batch 3) #66, fix: bring the Stepper, Input, Textarea, Sheet and Drawer templates up to the package #68: CLI templates reconciled with the package (RadioGroup, ScrollArea, DatePicker, TimePicker, Pagination, Toast, Skeleton, Sheet/Drawer and more)

Breaking for CLI template users (after shellui update, all in the notes with upgrade steps): Input.InputVariant becomes InputVariant (new input-variants template); Stepper parts read ActiveStep instead of taking CurrentStep; ScrollArea drops its scrollbar-* classes. update installs the new templates automatically.

This PR

• Directory.Build.props suffix alpha.3; README, VERSIONING_STRATEGY, CLI_INSTALLATION, CLI_SYNTAX, FAQ, QUICKSTART and the version fallbacks move to 0.4.0-alpha.3
• docs/RELEASE_NOTES.md: the 0.4.0-alpha.3 section; scripts/extract-release-notes.sh 0.4.0-alpha.3 extracts it

Release checks

• Release build has 0 warnings, and all 484 tests pass
• An app set up with the released 0.4.0-alpha.2 CLI, updated with the packed alpha.3 CLI: 36 components updated, input-variants, textarea-variants and stepper-models installed, builds 0/0
• CLI templates in a browser: RadioGroup selects (disabled items ignored), ScrollArea scrolls, Pagination @bind-CurrentPage, Stepper Next, DatePicker puts 1 October 2026 under Thursday, TimePicker Step="15" lists 00/15/30/45, Class="px-8 bg-destructive" replaces the button's own px-4 bg-primary, InputVariant.Error applies
• Focus trap with real key presses (templates and package): Tab cycles inside the dialog and wraps, Shift+Tab goes back, Escape closes and returns focus to the trigger
• All 93 direct targets together in my-app build 0/0 on net8.0, net9.0 and net10.0 (244 registry entries)
• The packed ShellUI.Components in a browser: the class override, TimePicker, dark mode with color-scheme, Popover Escape, Command Action, the dialog focus trap; no console errors

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