Add a prominent link to the full portfolio

The top bar's accent button becomes Portfolio (Email stays in the hero and
the contact band), the hero gets a Full portfolio button, and the project
list ends with a large block linking to it. The link points at Gitea's list
of repos with the portfolio topic; the sync supplies the count and the
resume file can override the target and label. Also eases the display
weight and tracking of the name in the dark theme.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XtcZtnG4GQA1d6mW5PNrS9

components/topbar.module.css

@@ -47,7 +47,7 @@
   background-size: 100% 1.5px;
 }
 
-.mail {
+.cta {
   margin-left: -12px;
   padding: 10px 18px;
   border-radius: var(--radius-control);
@@ -59,7 +59,7 @@
   transition: background-color 0.2s;
 }
 
-.mail:hover {
+.cta:hover {
   background: var(--z);
 }