Fix BlazeRuntime injection for wrapped engines (Sentry, Flare)

[ganyicz]

The scenario

• Using Blaze alongside packages that wrap the Blade engine (e.g., Sentry).
• Using Blaze alongside packages that register non-Blade view engines (e.g., Statamic Antlers).

The problem

Previously we used:

View::share(), which injected __blaze into every view, causing a serialization issue in Statamic (#83).

View::composer('*') with an instanceof CompilerEngine check, which fixed that, but broke Sentry (#89) — which decorates the Blade engine without extending CompilerEngine, failing the check and preventing __blaze from being injected.

The solution

Replace the engine class check with a file path check:

if (str_ends_with($view->getPath(), '.blade.php')) {

The file extension is invariant across engine wrapping and decoration:

• Blade views: .blade.php — matches
• Blade::render() string templates: written to {hash}.blade.php — matches
• PHP engine views: .php — no match
• Antlers views: .antlers.html — no match

Added integration tests for both the Sentry and Statamic scenarios.

Fixes #93