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

app/globals.css

@@ -40,6 +40,7 @@
 
   /* Light type on a dark ground looks heavier, so the display weight is eased off there */
   --name-weight: 800;
+  --name-tracking: -0.048em;
 
   /* Derived from the palette above, so they follow the theme */
   --line: color-mix(in srgb, var(--ink) 14%, transparent);
@@ -97,7 +98,8 @@
   --band-bg: #e8ebef;
   --band-ink: #15181d;
 
-  --name-weight: 730;
+  --name-weight: 700;
+  --name-tracking: -0.036em;
 }
 
 * { box-sizing: border-box; }