Add 1-page short CV variant, ORCID, profile photo, pre-commit hook

- cv-short.tex: two-column paracol layout (66/34) with curated content
  in the left column and an "at a glance" sidebar on the right.
  Locally tightens parskip, \cvsection and \cvevent so everything fits
  on a single A4 page, and redefines the sidebar list helper \sbitem
  to replace altacv's non-wrapping tikz \cvtag in the narrow column.
- chapters/short/{current,education,grants-selected,products,
  pubs-selected,sidebar}.tex: hand-curated highlight content
  (top 6 publications, top 6 grants, condensed two-line products,
  stats + recognition + leadership + research-focus sidebar blocks).
- chapters/header.tex / preamble.tex: ORCID 0000-0001-7512-8541
  via a new \orcid info field (faOrcid icon); blog field for
  giorgio.gilest.ro.
- images/gilestro.png: profile photo, used only by the short CV via
  altacv's circular \photoR.
- hooks/pre-commit + `make install-hooks`: rebuilds every variant on
  any .tex/.cls/Makefile change, aborts the commit on build failure,
  and stages refreshed PDFs into pdf/.
- Makefile: short target, hook-install target, dep glob extended to
  chapters/short/*.tex so the short build refreshes when its sources
  change.

chapters/short/grants-selected.tex

@@ -0,0 +1,9 @@
+% Selected grants (short CV) -- top 4 by size/significance
+\cvsection{Selected grants}
+
+\cvgrant{2024}{\$200k}{Chan Zuckerberg Initiative -- Collaborative Pairs Pilot Project (PI)}
+\cvgrant{2022}{£509k}{BBSRC Responsive Mode Research Grant (PI, BB/W016176/1)}
+\cvgrant{2018}{£414k}{BBSRC Responsive Mode Research Grant (PI, BB/R018839/1)}
+\cvgrant{2015}{£240k}{ERC Marie Skłodowska-Curie Individual Fellowship (host PI)}
+\cvgrant{2014}{£375k}{BBSRC Responsive Mode Research Grant (PI, BB/M003930/1)}
+\cvgrant{2009}{£270k}{Imperial College London Junior Research Fellowship}