v0.1.12

1. Added optional Analytics mappings for via_page_id and via_page_title.
2. WP FileTrace shortcodes now capture the originating WordPress page or post.
3. Manually embedded WP FileTrace links can also capture the current page context.
4. External/email downloads remain correctly identified as having no originating page.
5. Added {{via_page_id}} and {{via_page_title}} Download Page variables.
6. Kept download_id as the stable WP FileTrace tracker ID.
7. Improved the default download-page loading sequence.
8. Download spinner now fades out shortly after the fallback download message appears.
9. Added a Media Library selector for setting a logo or icon on the default download page.
10. Added an option to hide the default site-name text.
11. Added a standalone Back to main site button below the download content.
12. Added {{logo_url}} and {{site_url}} Download Page variables.
13. Preview mode supports the new branding and page-context options without triggering downloads or analytics.
14. Retry and return-to-site actions do not create duplicate download counts or GA events.