multithread interpolation render

[balparda]

No description provided.

[Copilot]

Pull request overview

This PR introduces parallelism for generating interpolated animation frames during zoom renders, aiming to speed up animation encoding by computing in-between frames concurrently.

Changes:

• Add a job/result worker model to interpolate frames in parallel inside InterpolatedFrameStream.
• Thread through a new max_threads parameter from the CLI into the interpolation stream.
• Update VS Code spellchecker dictionary for a newly introduced identifier (chunksize).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/tranzoom/core/zoom.py	Adds parallel interpolation via an executor-based worker pipeline and extends InterpolatedFrameStream with max_threads.
src/tranzoom/cli/base.py	Passes config.max_threads into the interpolation stream used for animation rendering.
.vscode/settings.json	Adds chunksize to workspace spellchecker words.