M4: read page transitions and display times (/Trans, /Dur) into DocInfo (#2074)

Each page's presentation settings of ISO 32000-2 s12.4.4 are read with the
spec's defaults for what is missing or out of range: the transition style,
duration, dimension, motion, direction, Fly scale and backdrop, and the
/Dur display time. doc_info lists them; pdfcraft-cli info counts them.
This is the data full screen needs to play transitions and auto-advance;
playing and editing them stay planned.

Refs #379, #2070.


Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

parity/acrobat-features.toml

@@ -3193,11 +3193,11 @@ title = "Page transitions"
 area = "D"
 tier = "P2"
 milestone = "M4"
-status = "planned"
+status = "partial"
 commands = []
-tools = []
-evidence = []
-notes = ""
+tools = ["doc_info"]
+evidence = ["crates/render/src/inspect.rs::page_transitions_and_display_times_are_read", "crates/automation/tests/automation.rs::doc_info_lists_page_transitions_and_display_times"]
+notes = "Read only: each page's /Trans (style, duration, dimension, motion, direction, Fly scale and backdrop) and /Dur display time are read with the spec's defaults for what is missing or out of range, and doc_info lists them (DocInfo::transitions). Not yet: playing them in full screen, auto-advancing on /Dur, or the Page Transitions dialog that sets them"
 
 [[feature]]
 id = "organize.page-tab-order"