Fix writeToFile -1700 type coercion error on file close

[weijianfan]

Summary

• close access was called without an argument, causing AppleScript to close "current application" instead of the file descriptor, resulting in a -1700 type coercion error
• Fixed close access → close access fileDescriptor
• Added set eof of fileDescriptor to 0 before writing to cleanly truncate existing files
• Added shell fallback via printf if AppleScript file access fails
• Added do shell script "touch ..." before open for access to ensure the file exists upfront

Test plan

• Export notes and verify files are written without -1700 error
• Test with pre-existing files to verify clean truncation
• Verify shell fallback triggers gracefully if AppleScript file access fails

🤖 Generated with Claude Code

[sai3563]

Why is this PR diff in an opaque binary blob format that cannot be reviewed when the original file itself can be read as plain text?

There are way too many supply chain attacks going on these days that fall though the OSS review process cracks because of binary blobs.

Ironically, Claude Code itself calls this suspicious and here is it's suggestion:

This may be a real fix, but the submission format is wrong. Please resubmit the change as plain-text AppleScript matching the existing repository format, not as a compiled .scpt blob

[sai3563]

Also, from the description alone(since I cannot see source code), it seems my PR raised before at least partly does the same thing.

https://github.com/storizzi/notes-exporter/pull/24/changes