fix(quarto): repair LaTeX + Typst branded templates

- LaTeX: capture pandoc's \subtitle into \thesubtitle so subtitled PDFs
  compile; suppress the default \maketitle/abstract so only the branded
  title page renders (no double title); drop the unused tikz dependency
  from the title partial (#13)
- LaTeX: stop requiring a "Source Serif 4 SemiBold" face that the setup
  never installs; use the family's native Bold weight (#14)
- Typst: wrap title/subtitle/date in [ ] so text containing Typst keywords
  ("for"/"in") no longer breaks compilation (#12)
- Fix footer URL civilytics.consulting -> civilytics.com in the LaTeX and
  Typst templates and the slides example (#11)
- Bump version to 0.3.0

inst/quarto/latex/civilytics-title.tex

@@ -2,6 +2,11 @@
 % Replaces Quarto's default \maketitle. Uses values from YAML
 % (\thetitle, \theauthor, \thedate) plus an \ifabstract block.
 
+% Guard: \thesubtitle is normally defined by civilytics.tex's subtitle
+% capture; provide a fallback so this partial degrades gracefully if used
+% without that preamble. See civilyticsR issue #13.
+\providecommand{\thesubtitle}{}
+
 \begin{titlepage}
   \pagecolor{paper}
   \color{ink}
@@ -33,8 +38,6 @@
 
   % Pulse mark, in ember
   \begin{center}
-    \begin{tikzpicture}[overlay, remember picture]
-    \end{tikzpicture}
     {\color{ember}\rule{40pt}{2pt}}
   \end{center}
 \end{titlepage}