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/sidebar.tex

@@ -0,0 +1,33 @@
+% Sidebar content for the short CV (right column in paracol layout).
+
+\cvsection{At a glance}
+
+\cvachievement{\faTrophy}{£2.5M+}{secured as Principal Investigator}
+\cvachievement{\faHandshake}{£590k+}{secured as co-Principal Investigator}
+\cvachievement{\faBook}{25+}{peer-reviewed publications}
+\cvachievement{\faMicrophone}{50+}{invited talks worldwide (past 7 yrs)}
+\cvachievement{\faUserGraduate}{9}{trained PhDs and postdocs, now in faculty / R\&D positions}
+
+\cvsection{Recognition}
+
+\sbitem{Excellence in Teaching, Imperial College}
+\sbitem{ERC Marie Curie IF holder}
+\sbitem{Edmond J. Safra fellow}
+\sbitem{Imperial Junior Research Fellow}
+\sbitem{Senior / corresponding author in \textit{Science}, \textit{Nature}, \textit{Nat.\,Comm.}, \textit{Sci.\,Advances}, \textit{PLoS Biology}}
+
+\cvsection{Leadership \& service}
+
+\sbitem{UK rep, European \textit{Drosophila} Board}
+\sbitem{Vice-Chair, EU MCSE \& HADEA}
+\sbitem{Co-founder, JEDI Network}
+\sbitem{Director, MSc ABB (2017--2024)}
+\sbitem{Academic Editor, PLoS~ONE (2011--2022)}
+\sbitem{Reviewer for 35+ academic journals}
+
+\cvsection{Research focus}
+
+\sbitem{\textit{Drosophila} sleep \& behaviour}
+\sbitem{High-throughput ethomics}
+\sbitem{Open-source neuroscience instrumentation}
+\sbitem{Systems neurobiology}