This PR implements TemplateProxy patching to restore compatibility between django-components and template_partials, as suggested by @carltongibson in issue #1323.

Problem

When both django-components and template_partials are used together, the TemplateProxy class from template_partials doesn't receive the same monkey-patching that django-components applies to Django's Template class. This can lead to compatibility issues with component context handling and dependency rendering.

Solution

The fix adds conditional patching of TemplateProxy when template_partials is detected in INSTALLED_APPS:

1. Enhanced monkey-patching system: Added monkeypatch_template_proxy_cls() and monkeypatch_template_proxy_render() functions that apply the same context handling and dependency rendering logic to TemplateProxy as is applied to Django's Template class.

2. Conditional activation: Modified ComponentsConfig.ready() to check for "template_partials" in settings.INSTALLED_APPS and automatically patch TemplateProxy if present.

3. Safe error handling: The implementation gracefully handles cases where template_partials is listed in INSTALLED_APPS but not actually installed.

Key Features

• Seamless integration: No changes required from users - the patching happens automatically when both packages are installed
• Component context compatibility: TemplateProxy now properly handles component nesting and isolation contexts
• Dependency rendering: Template partials now participate in django-components' CSS/JS dependency system
• Backward compatible: Existing functionality remains unchanged when template_partials is not used

Example Usage

# In settings.py
INSTALLED_APPS = [
    'django_components',
    'template_partials',  # TemplateProxy will be automatically patched
    # ...
]

<!-- Templates can now use both systems together -->
{% load component_tags %}
{% load partials %}

{% partialdef header %}
<header>Shared header</header>
{% endpartialdef %}

{% component "my_component" %}{% endcomponent %}
{% partial header %}

The patching ensures that template partials work correctly within component contexts and that any CSS/JS dependencies are properly rendered.

Fixes #1327.

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.