poc4 wit rust

app/static/css/app.css

@@ -68,3 +68,5 @@ html,body{min-height:100%;background:var(--bg);color:var(--text)}body{overflow-x
 /* Compact secondary navigation inside data-heavy primary views. */
 .subtabs{display:flex;align-items:center;gap:5px;margin:0 0 12px;padding:5px;border:1px solid var(--line-soft);border-radius:9px;background:#0e0f11;overflow-x:auto;scrollbar-width:thin}.subtab-button{flex:0 0 auto;border:1px solid transparent;border-radius:6px;background:transparent;color:#777880;padding:7px 11px;font-size:11px;font-weight:600;cursor:pointer;white-space:nowrap;transition:.14s ease}.subtab-button:hover{color:#d6d6db;background:#141517}.subtab-button.active{color:#f4f4f5;background:#191a1d;border-color:#2b2c30;box-shadow:0 1px 2px rgba(0,0,0,.18)}.subtab-button.active::before{content:'';display:inline-block;width:6px;height:6px;margin-right:7px;border-radius:999px;background:var(--green);vertical-align:1px}.subtab-panel{display:none}.subtab-panel.active{display:block}.panel-stack{display:grid;gap:12px;align-content:start;min-width:0}
 @media(max-width:780px){.subtabs{margin-bottom:10px}.subtab-button{padding:7px 10px}.panel-stack{width:100%}}
+
+.metric-sub.metric-sub-bad{color:#d99a9a}