feat: improve daily image management

[Willxup]

Summary

• add historical paths directly from image details and remember gallery/upload preferences
• add batch and multi-upload link copying with persistent direct, Markdown, BBCode, and HTML formats
• keep copy-format menus usable across upload cards, bottom batch toolbar, narrow layouts, and mobile
• use the latest image tag in README examples

Verification

• make check
• make e2e (desktop and mobile, 2 passed)
• two-agent adversarial review; the shared mobile clipping finding was fixed and covered by mobile E2E