Reshape BrowserOptions server-to-client configuration API per review

[Copilot]

Applies the approved API review decisions for the Blazor BrowserOptions surface that flows host configuration to the browser client via the <!--Blazor-Configuration:{...}--> DOM comment. The wire format is preserved through JSON converters/attributes, so no JS changes are required.

Description

• Render-mode property renames on BrowserOptions (get-only, pre-initialized), with [JsonPropertyName] keeping the existing wire keys:
  • Server → InteractiveServer (server)
  • Ssr → StaticServer (ssr)
  • WebAssembly → InteractiveWebAssembly (webAssembly)
• Type renames: SsrBrowserOptions → StaticServerBrowserOptions, WebAssemblyBrowserOptions → InteractiveWebAssemblyBrowserOptions (InteractiveServerBrowserOptions unchanged).
• Accessor moved off HttpContext: removed BrowserOptionsHttpContextExtensions; GetBrowserOptions is now a static method BrowserOptions.GetBrowserOptions(HttpContext).
• ConfigureBrowser: the HttpContext cascading parameter is now internal, removing it from the public API while remaining functional.
• Updated internal consumers (EndpointHtmlRenderer, Server.AutoPause, test server startup, Root.razor) and PublicAPI.Unshipped.txt.
• Added BrowserOptionsTest covering wire-key preservation, TimeSpan→ms conversion, negated PreserveDom→disableDomPreservation, extension-data flattening, GetBrowserOptions caching/metadata seeding, and MergeInto semantics.

app.MapRazorComponents<App>()
    .WithBrowserOptions(options =>
    {
        options.LogLevel = LogLevel.Warning;
        options.InteractiveServer.ReconnectionMaxRetries = 10;
        options.InteractiveServer.ReconnectionRetryInterval = TimeSpan.FromSeconds(1.5);
        options.StaticServer.PreserveDom = true;
        options.InteractiveWebAssembly.EnvironmentName = "Staging";
        options.InteractiveWebAssembly.EnvironmentVariables["OTEL_ENDPOINT"] = "https://...";
    });

Fixes #66393.

[Copilot]

Pull request overview

Reshapes the Blazor BrowserOptions server-to-client configuration API (used for the <!--Blazor-Configuration:{...}--> payload) to match the approved API review: renamed render-mode option properties/types while preserving existing wire keys, and moved GetBrowserOptions off HttpContext extensions onto BrowserOptions.

Changes:

• Renamed BrowserOptions sub-option properties to InteractiveServer, StaticServer, and InteractiveWebAssembly, using [JsonPropertyName] to preserve server, ssr, and webAssembly wire keys.
• Replaced BrowserOptionsHttpContextExtensions.GetBrowserOptions(HttpContext) with BrowserOptions.GetBrowserOptions(HttpContext) and updated call sites.
• Updated public API declarations and added tests validating serialization/wire compatibility and option merging/caching behavior.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Components/test/testassets/Components.TestServer/RazorComponentEndpointsStartup.cs	Updates test server configuration to use InteractiveWebAssembly property.
src/Components/Server.AutoPause/src/AutoPauseBrowserOptionsExtensions.cs	Updates auto-pause option injection to target InteractiveServer extensions.
src/Components/Endpoints/test/BrowserOptionsTest.cs	Adds tests for wire-key preservation, converters, extension-data flattening, caching, and merge semantics.
src/Components/Endpoints/src/Rendering/EndpointHtmlRenderer.Streaming.cs	Switches to BrowserOptions.GetBrowserOptions(HttpContext) and updates WebAssembly defaults to InteractiveWebAssembly.
src/Components/Endpoints/src/PublicAPI.Unshipped.txt	Reflects public API renames and removes the HttpContext extension API surface.
src/Components/Endpoints/src/BrowserConfiguration/StaticServerBrowserOptions.cs	Renames SsrBrowserOptions to StaticServerBrowserOptions and updates docs.
src/Components/Endpoints/src/BrowserConfiguration/InteractiveWebAssemblyBrowserOptions.cs	Renames WebAssemblyBrowserOptions to InteractiveWebAssemblyBrowserOptions.
src/Components/Endpoints/src/BrowserConfiguration/ConfigureBrowser.cs	Makes the cascading HttpContext parameter internal and updates merge logic to new property names.
src/Components/Endpoints/src/BrowserConfiguration/BrowserOptionsHttpContextExtensions.cs	Removes the HttpContext extension-based accessor.
src/Components/Endpoints/src/BrowserConfiguration/BrowserOptions.cs	Introduces BrowserOptions.GetBrowserOptions(HttpContext) and applies JsonPropertyName to preserve existing wire keys.