fix: restore authored PDF dates and titles

[utensil]

Scope

• restore the nine reported taxon-card titles to their authored lowercase casing
• remove the two explicit CA parent declarations that add unwanted section context
• hide only the generated root prefix on UTS translation subsection titles, in both web and PDF output
• render each PDF root's authored \\date on its title page

SOURCE_DATE_EPOCH=0 remains unchanged: PDF metadata stays reproducible and intentionally reports the epoch, while the visible publication date now comes from each source tree.

Verification

• CI=1 ./chk.sh
• just build
• just verify-render — 1,222 pages
• just verify-pdf-fixtures — 10 fixtures, including a visible-date assertion from source dates
• browser readback of the nine labels plus CA and UTS headings

PR #126 is intentionally untouched.