[Velli20]

Summary

• Decode /S /Hide actions (/T field names or object references, /H), flatten /Next chains into AnnotationAction::Sequence, and read widget /AA pointer and focus triggers (E X D U Fo Bl) plus each widget's partial field names. The new fields are #[serde(default)], so existing sidecars still load.
• Add the Core operation SetHidden { hidden, shown } and the change event Change::VisibilityUpdated. A Hide action sets or clears each target's /F Hidden flag as one revision. Targets already in the requested state are skipped, so repeating an action commits nothing.
• AnnotationOverlay::perform_action(id, trigger) replaces set_optional_content_state at every layer:
  • Hide steps commit the Core edit.
  • SetOCGState steps change optional content visibility.
  • All other steps come back in ActionReceipt::host_actions for the host.
• Entries list the triggers that have an action. The web layer reports activation, pointer enter/exit, press/release and focus/blur for those triggers. A checkbox or radio also runs its /A action after its value is saved.

Test plan

• cargo clippy --workspace --all-targets -- -D warnings, cargo fmt --check
• cargo test for pdf-annotation-core, pdf-web, pdf-renderer, pdf-document, pdf-object-reader
• cargo xtask annotation-types --check, cargo xtask web-canvas --profile debug
• Overlay check on a hide/show form (two push buttons whose Hide chains cover 9 checkboxes and 9 radios):
  • Hide Form leaves only the 2 buttons visible.
  • Hovering Show Form (cursor-enter action) brings the visible count back to 11.
  • Clicking Show Form brings it back to 20, and the widgets that reappear are editable.
• Browser click-through in the web-canvas example
• CI tsc check of crates/pdf-web/js

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