Replace straight quotes with curly quotes in user-facing strings

[Copilot]

Plan: Use Curly Quotes in User-Facing Strings ✅

• Understand the current state of quotes in the codebase
• Replace straight quotes with curly quotes in AppResources.swift
  • Replace single quotes (') with curly quotes (')
  • Replace double quotes (") with curly quotes (" and ")
• Update corresponding xcstrings files with matching curly quotes
  • MarkEditMac/Resources/Localizable.xcstrings
  • MarkEditMac/mul.lproj/Main.xcstrings (no changes needed)
  • MarkEditMac/AppShortcuts.xcstrings (no changes needed)
  • FinderExtension/Localizable.xcstrings (no changes needed)
  • PreviewExtension/mul.lproj/Main.xcstrings (no changes needed)
• Verify the build succeeds (syntax validated)
• Request code review (passed with no issues)
• Run security checker (no vulnerabilities found)
• Fix xcstrings formatting issue (preserve spaces after colons)

Summary

All user-facing strings now use proper curly quotes:

• 2 apostrophes replaced: Couldn't, You're
• 5 pairs of double quotes replaced around placeholders
• Only 1 xcstrings file updated (Localizable.xcstrings), others didn't contain affected strings
• Original JSON formatting preserved (spaces after colons maintained)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Use curly quotes</issue_title>
<issue_description>For user-facing strings only:

• Search the Localized enum and its extensions
• Replace both single quotes and double quotes with their curly forms
• Update corresponding xcstrings files</issue_description>

<agent_instructions>Follow the issue description closely, make no mistake.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Use curly quotes #1231

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[cyanzhong]

@copilot You should not be re-formatting the xcstrings, spaces after " should be kept.

[Copilot]

@copilot You should not be re-formatting the xcstrings, spaces after " should be kept.

Fixed in 8c79901. The xcstrings files now preserve the original formatting with spaces after colons (:) and only the string keys have been updated to use curly quotes.