feat(html): make the navigator profile configurable

[Sonic-Y3k]

Configurable navigator profile

Split out of #274, taking the approach suggested there: rather than hardcoding a
single browser identity in core, the values reported by navigator are
configurable per browser.

• html.NavigatorProfile holds the configurable fields (user agent, platform,
  vendor, language(s), hardware concurrency).
• browser.WithNavigator(profile) sets it; unset fields fall back to
  html.DefaultNavigatorProfile, which describes a current Chrome release so apps
  under test see a realistic, modern browser.
• The navigator data attributes read their values from the per-window
  html.Navigator instance, so each browser reports its own profile.

Tested in the shared script-engine suite (both V8 and Sobek), covering the
default profile and an override.

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AI disclosure: This change was developed with the help of an AI coding assistant. I've reviewed and tested it myself; it follows the existing conventions and the full test suite (main module, v8engine, sobekengine) passes locally.

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 2ad932f0-a462-47f0-b169-08738506c929

📥 Commits

Reviewing files that changed from the base of the PR and between 98adcf9 and e2e2a7e.

📒 Files selected for processing (7)

• browser.go
• html/navigator.go
• html/window.go
• scripting/internal/html/initializer.go
• scripting/internal/html/navigator.go
• scripting/internal/scripttests/navigator_suite.go
• scripting/internal/scripttests/suites.go

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