Enables saving all patterns (both synced and unsynced) to the theme, not just synced patterns. Previously, only synced patterns would be exported when using the "Save Patterns" option.

What Changed

User-Facing Changes:

• The "Save Synced Patterns" option has been renamed to "Save Patterns"
• All patterns created in the Editor (both synced and unsynced) will now be saved to the theme when this option is enabled
• Unsynced patterns are now included in the export and removal process

Technical Changes:

• Refactored pattern processing to store raw content first, then wrap in PHP file structure after processing
• Options are now threaded through to replace_local_pattern_references() to ensure consistent processing
• Removed the sync status check that previously filtered out unsynced patterns

Why?

This allows theme designers to create their own patterns for themes.

Testing Instructions

Test Case 1: Save All Pattern Types

1. Go to Appearance → Editor → Patterns
2. Create 2 patterns - a synced and an unsynced.
3. Go to Create Block Theme in the editor
4. Save Changes to Theme
5. Enable "Save Patterns" checkbox
6. Click "Save Changes"
7. ✅ Expected: Both patterns should be saved to /patterns/ directory as .php files
8. ✅ Expected: Both patterns should be deleted from the Editor
9. ✅ Expected: Patterns should now load from the theme instead of the database

Test Case 2: Duplicate Pattern Names

1. Manually create a pattern file: wp-content/themes/your-theme/patterns/test-pattern.php
2. In the Editor, create a new pattern with the title "Test Pattern" (same slug)
3. Try to save patterns using Create Block Theme
4. ✅ Expected: Should show an error: "A pattern with this name already exists: test-pattern"

Test Case 3: Localization Options

1. Create a pattern with text content: "Hello World"
2. Go to Create Block Theme overwrite screen
3. Enable both:
   - ✅ "Save Patterns"
   - ✅ "Localize Text"
4. Save changes
5. Inspect the pattern file
6. ✅ Expected: Text should be wrapped in localization functions:

Test Case 4: Image Localization

1. Create a pattern with an image from the Media Library
2. Enable both:
   - ✅ "Save Patterns"
   - ✅ "Localize Images"
3. Save changes
4. ✅ Expected: Image should be copied to /assets/ directory
5. ✅ Expected: Pattern should reference the local image path

Test Case 5: Templates Referencing Patterns

1. Create a pattern and add it to a template
2. Modify the template (add a paragraph block)
3. Save with both "Save Template Changes" and "Save Patterns" enabled
4. ✅ Expected: Both the template and pattern should be saved
5. ✅ Expected: Template changes should be preserved
6. ✅ Expected: Pattern reference should be updated correctly

Test Case 6: UI Label Update

1. Go to Create Block Theme overwrite screen
2. ✅ Expected: Checkbox should read "Save Patterns" (not "Save Synced Patterns")
3. ✅ Expected: Help text should say "All patterns created in the Editor will be moved to the theme..."