Improve cockpit typography for readability across all pages.

Raise base font to 16px, enlarge sidebar, buttons, tables and headings, add Inter font and global typography layer.

cockpit/static/css/app-sidebar-neo.css

@@ -25,13 +25,13 @@
   border-bottom: 1px solid rgba(148, 163, 184, 0.08);
 }
 .app-sidebar-brand .brand-title {
-  font-size: 0.58rem;
-  letter-spacing: 0.14em;
+  font-size: 0.75rem;
+  letter-spacing: 0.1em;
   color: #64748b;
   margin: 0;
 }
 .app-sidebar-brand .brand-name {
-  font-size: 0.95rem;
+  font-size: 1.05rem;
   font-weight: 700;
   color: #e2e8f0;
   margin: 0.2rem 0 0;
@@ -50,7 +50,7 @@
   color: #94a3b8;
   border-radius: 8px;
   padding: 0.45rem 0.25rem;
-  font-size: 0.58rem;
+  font-size: 0.8125rem;
   font-weight: 700;
   letter-spacing: 0.03em;
   text-transform: uppercase;
@@ -65,8 +65,8 @@
   margin-bottom: 0.65rem;
 }
 .app-sidebar-label {
-  font-size: 0.56rem;
-  letter-spacing: 0.12em;
+  font-size: 0.75rem;
+  letter-spacing: 0.08em;
   text-transform: uppercase;
   color: #64748b;
   padding: 0.2rem 0.5rem 0.35rem;
@@ -80,12 +80,12 @@
   gap: 0.5rem;
   width: 100%;
   margin: 0 0 0.2rem;
-  padding: 0.5rem 0.55rem;
+  padding: 0.55rem 0.65rem;
   border-radius: 8px;
   border: 1px solid rgba(148, 163, 184, 0.1);
   background: rgba(15, 23, 42, 0.5);
   color: #cbd5e1 !important;
-  font-size: 0.78rem;
+  font-size: 0.9375rem;
   font-weight: 500;
   text-decoration: none;
   text-align: left;
@@ -121,14 +121,14 @@
 }
 
 .sidebar-nav-icon {
-  width: 26px;
-  height: 26px;
+  width: 28px;
+  height: 28px;
   flex-shrink: 0;
   display: flex;
   align-items: center;
   justify-content: center;
   border-radius: 6px;
-  font-size: 0.85rem;
+  font-size: 0.95rem;
   background: rgba(8, 12, 18, 0.9);
   border: 1px solid rgba(148, 163, 184, 0.12);
 }
@@ -169,7 +169,7 @@
 
 .persona-badge {
   display: inline-block;
-  font-size: 0.62rem;
+  font-size: 0.75rem;
   font-weight: 800;
   letter-spacing: 0.08em;
   padding: 0.15rem 0.45rem;