Exclude dotfiles from project video and pose file discovery

[gbeane]

Summary

Initializing or loading a JABS project stored on a macOS external drive (exFAT/NTFS)
crashed during the video scan with:

OSError: Unable to synchronously open file (file signature not found)

macOS writes an AppleDouble sidecar (._<name>) next to every file on non-APFS/HFS+
volumes. Unlike the shell, pathlib.Path.glob("*") matches these leading-dot files, so
the scan treated ._video.mp4 as a real video and handed its companion
._video_pose_est_v8.h5 sidecar (which is not valid HDF5) to h5py.

Fix

Skip dotfiles at the two directory-discovery sites:

• VideoManager.get_videos() no longer returns names beginning with ..
• ProjectPaths.create_directories() validation (has_video / has_pose) ignores
  dotfiles, so a directory containing only sidecars is correctly rejected as "not a valid
  JABS project" instead of falsely passing.

Tests

• test_video_manager.py::test_get_videos_excludes_dotfiles
• test_project_paths.py::test_create_directories_ignores_dotfile_videos_and_poses
• test_project_paths.py::test_create_directories_validates_real_project

[Copilot]

Pull request overview

This PR fixes a macOS-on-external-drive crash during JABS project discovery by ensuring leading-dot “sidecar” files (notably AppleDouble ._*) are ignored when scanning for videos and validating project structure.

Changes:

• Update VideoManager.get_videos() to skip dotfiles during video discovery.
• Update ProjectPaths.create_directories() validation to ignore dotfile videos and pose HDF5 sidecars.
• Add tests covering both dotfile exclusion and validation behavior for real vs. sidecar-only directories.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/project/test_video_manager.py	Adds regression test ensuring get_videos() excludes dotfiles (including AppleDouble sidecars).
tests/project/test_project_paths.py	Adds validation tests to ensure dotfile-only directories are rejected and real projects pass even with sidecars present.
src/jabs/project/video_manager.py	Filters out dotfile entries during video enumeration to avoid treating AppleDouble sidecars as videos.
src/jabs/project/project_paths.py	Filters out dotfiles during “has_video/has_pose” validation so sidecar-only dirs don’t look like valid projects.

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