docs(manim-video): expand references with comprehensive Manim CE and 3b1b patterns
Adds 601 lines across 6 reference files, sourced from deep review of:
- Manim CE v0.20.1 full reference manual
- 3b1b/manim example_scenes.py and source modules
- 3b1b/videos production CLAUDE.md and workflow patterns
- Manim CE thematic guides (voiceover, text, configuration)
animations.md: always_redraw, TracedPath, FadeTransform,
TransformFromCopy, ApplyMatrix, squish_rate_func,
ShowIncreasingSubsets, ShowPassingFlash, expanded rate functions
mobjects.md: SVGMobject, ImageMobject, Variable, BulletedList,
DashedLine, Angle/RightAngle, boolean ops, LabeledArrow,
t2c/t2f/t2s/t2w per-substring styling, backstroke for readability,
apply_complex_function with prepare_for_nonlinear_transform
equations.md: substrings_to_isolate, multi-line equations,
TransformMatchingTex with matched_keys and key_map,
set_color_by_tex
graphs-and-data.md: Graph/DiGraph with layout algorithms,
ArrowVectorField/StreamLines, ComplexPlane/PolarPlane
camera-and-3d.md: ZoomedScene with inset zoom,
LinearTransformationScene for 3b1b-style linear algebra
rendering.md: manim.cfg project config, self.next_section()
chapter markers, manim-voiceover plugin with ElevenLabs/GTTS
integration and bookmark-based audio sync
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