[lakigigar]

Problem

Play fails with "building slide N failed" on any slide made with New Slide that has no animation. The build log shows manim-slides refusing it:

ValidationError: 1 validation error for PreSlideConfig
  Value error, You have to play at least one animation (e.g., 'self.wait()') before pausing.

A new slide's construct() ended in pass. Once text was typed into its placeholders, pass was removed and only self.add(...) calls were left, with no animation.

Fix

_layout_body now ends a new slide with self.wait(0.1) # manimble new slide instead of pass. New builds already do the same thing (new_build adds self.wait(0.1) # manimble new build for the same reason). Like pass, the statement keeps the # manimble placeholder comments inside the class. Unlike pass, it is never removed. Slides made before this change keep their pass handling, and the comment there now says so.

Testing

• engine/manimble/core.py compiles.
• A slide written the way the new template writes it (placeholder comments followed by self.wait(0.1)) builds with manim_slides render: "Played 1 animations", and slides/NewSlide1.json is written.
• A real deck slide that had failed (only self.add(...)) builds once self.wait(0.1) is appended.
• Not tested: the New Slide → type text → Play flow in the app itself. tests/ has no coverage of new slides.

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