style: enforce 12px minimum font size across all components

Add --font-size-min: 12px token to tokens.css. Replace all 10px and 11px
font-size declarations with 12px across 54 CSS module files for improved
readability.

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

src/pages/AgentHealth/AgentHealth.module.css

@@ -19,7 +19,7 @@
 .breakdown {
   display: flex;
   gap: 8px;
-  font-size: 11px;
+  font-size: 12px;
   font-family: var(--font-mono);
 }
 
@@ -52,7 +52,7 @@
 
 .scopeSep {
   color: var(--text-muted);
-  font-size: 10px;
+  font-size: 12px;
 }
 
 .scopeCurrent {
@@ -76,7 +76,7 @@
 }
 
 .sectionMeta {
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
   font-family: var(--font-mono);
 }
@@ -101,7 +101,7 @@
   display: flex;
   align-items: center;
   gap: 16px;
-  font-size: 11px;
+  font-size: 12px;
   color: var(--text-muted);
 }
 
@@ -118,7 +118,7 @@
   gap: 8px;
   padding: 8px 16px;
   background: var(--error-bg);
-  font-size: 11px;
+  font-size: 12px;
   color: var(--error);
   font-weight: 500;
 }
@@ -192,7 +192,7 @@
 }
 
 .chartTitle {
-  font-size: 11px;
+  font-size: 12px;
   font-weight: 600;
   color: var(--text-secondary);
   text-transform: uppercase;