Feat v0.6.14 visual polish

Fix v0.6.13 spacing regressions with half-step tokens (--sp-1h 6px,
--sp-2h 10px). Purge ~65 stale hex/rgba fallback values from var() calls
including all old gold #b38a4e references. Self-host DM Sans and JetBrains
Mono woff2 fonts, eliminating Google Fonts CDN dependency. Standardize
border-radius to three tokens (--radius-sm 4px, --radius 8px, --radius-lg
12px) across all kernel CSS and 12 extension packages.

Also fixes: theme settings showing resolved mode instead of stored preference,
surface-inner overflow causing notes scrollbar and chat input clipping at
high zoom, user menu drift at scale >100% from zoom-unaware fixed positioning,
and three undefined CSS variable references.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/schedules/css/main.css

@@ -100,7 +100,7 @@
   font-size: 0.8rem;
   background: var(--bg-raised);
   padding: 2px var(--sp-2);
-  border-radius: 4px;
+  border-radius: var(--radius-sm);
   color: var(--text-2);
 }
 
@@ -128,7 +128,7 @@
   font-size: 0.75rem;
   font-weight: 600;
   padding: 2px var(--sp-3);
-  border-radius: 10px;
+  border-radius: var(--radius-lg);
   border: 1px solid var(--border);
   cursor: pointer;
   transition: background 0.15s, color 0.15s;
@@ -153,7 +153,7 @@
   background: none;
   border: 1px solid var(--border);
   color: var(--text-2);
-  border-radius: 4px;
+  border-radius: var(--radius-sm);
   cursor: pointer;
   transition: background 0.15s;
 }
@@ -206,7 +206,7 @@
 .ext-schedules-logs {
   background: var(--bg-surface);
   border: 1px solid var(--border);
-  border-radius: 8px;
+  border-radius: var(--radius);
   overflow: hidden;
 }