Add option to skip capture if target file already exists

[chhoumann]

Summary

Add an option to prevent capture operations when the target file already exists, useful for one-time note creation workflows.

Problem

Currently, if a capture target file already exists:

• Content is always added to the existing file
• No notification that file already existed
• Can result in unwanted duplicate content
• No way to prevent accidental additions to existing notes

Use Cases

• One-time note creation: Daily notes, meeting notes, project kickoffs
• Prevent duplicates: Avoid adding the same content multiple times
• Template initialization: Only create initial template content once
• Error prevention: Avoid accidental captures to wrong existing files

Proposed Solution

Add setting in Capture Choice configuration:

• "Skip if file exists" checkbox
• When enabled and target file exists:
  • Show notification: "File already exists, capture skipped"
  • Do not add content to existing file
  • Optionally offer to open existing file instead

Implementation Ideas

• File existence check before capture operation
• User-friendly notification system
• Option to open existing file as alternative action
• Could be combined with file creation date checks

Benefits

• Prevents accidental content duplication
• Better workflow for one-time note creation
• More predictable capture behavior
• Reduces user errors