👌 Streamline internal CSS (#1178)

This commit restructures the internal CSS used by the extension, with the goal of improving compatibility sphinx theme extensions.

- `common.css` is split into multiple files, relating to their purpose.
- most hard-coded colors set within the CSS are replaced with CSS variables, that can be set/overridden by themes/users
- most per-theme CSS is replaced with simply defining the CSS variable colors (removing a lot of duplication)
- Outdated/deprecated handling of CSS/JS in `sphinx_needs/environment.py` is replaced with modern sphinx methods

docs/configuration.rst

@@ -1637,28 +1637,9 @@ This may be needed to avoid custom table handling of some specific Sphinx theme
 
    needs_table_classes = ['my_custom_class', 'another_class']
 
-Default: ``['rtd-exclude-wy-table', 'no-sphinx-material-strip']``
-
-This classes are not set for needtables using the ``table`` style, which is using the normal Sphinx table layout
+These classes are not set for needtables using the ``table`` style, which is using the normal Sphinx table layout
 and therefore must be handled by themes.
 
-The following themes support the following table classes to deactivate their specific handling:
-
-.. list-table::
-
-   - * Theme
-     * Class
-   - * ReadTheDocs
-     * ``rtd-exclude-wy-table``
-   - * Sphinx-Material
-     * ``no-sphinx-material-strip``
-
-.. hint::
-
-   The deactivation of theme specific table handling is quite a new feature in most themes.
-   Please be sure to use the newest theme version or even the nightly build.
-
-
 .. _needs_builder_filter:
 
 needs_builder_filter

pyproject.toml

@@ -102,7 +102,7 @@ markers = [
 ]
 filterwarnings = [
   "ignore:.*removed in Python 3.14.*:DeprecationWarning",
-  # "ignore::sphinx.deprecation.RemovedInSphinx90Warning"
+  "ignore::PendingDeprecationWarning:sphinx_data_viewer.*",
 ]
 
 

sphinx_needs/config.py

@@ -6,7 +6,7 @@
 from sphinx.application import Sphinx
 from sphinx.config import Config as _SphinxConfig
 
-from sphinx_needs.defaults import DEFAULT_DIAGRAM_TEMPLATE, NEEDS_TABLES_CLASSES
+from sphinx_needs.defaults import DEFAULT_DIAGRAM_TEMPLATE
 
 if TYPE_CHECKING:
     from sphinx.util.logging import SphinxLoggerAdapter
@@ -376,8 +376,7 @@ def __setattr__(self, name: str, value: Any) -> None:
         default="is_external==False", metadata={"rebuild": "html", "types": (str,)}
     )
     table_classes: list[str] = field(
-        default_factory=lambda: NEEDS_TABLES_CLASSES,
-        metadata={"rebuild": "html", "types": (list,)},
+        default_factory=list, metadata={"rebuild": "html", "types": (list,)}
     )
     """Additional classes to set for needs and needtable."""
     string_links: dict[str, dict[str, Any]] = field(