Video work (#2402)

* Bug fix for TransformMatchingStrings with incompatible lengths

* Change faded line in NumberPlane initialization to be more explicit, and lower opacity

* Add option hide_zero_components_on_complex to DecimalNumber

* Validate syntax before reloading

* Add remembered stroke_config to TracedPath

* Add CLAUDE.md to gitignore

* Move pre-calculated traced points to TracingTail

* Fix interplay between time_span and alpha in Animation

* Clearer init for points in TracingTail

* Fix CoordinateSystem.get_area_under_graph

* Allow ComplexPlane.n2p to take in array of complex numbers

* Add put_start_on and put_end_on

* Add Slider

* Add \minus option for Tex to give shorter negative sign

* Put interp_by_hsl option in various color interpretation functions

* Swap priority of matched_keys vs key_map is TransformMatchingStrings

* Have z-index apply recursively

* Set self.svg_string property for SVGMobject

* Fix num_decimal_places config in Tex.make_number_changeable

* Add Surface. color_by_uv_function

* Add VMobject. set_color_by_proportion

* Add \mathcal to tex_to_symbol_count