feat: add miner detail view

backend/app/frontend/static/app.css

@@ -1618,3 +1618,107 @@ button.map-position:hover {
     .dashboard-section *,
     .attention-list * { scroll-behavior: auto; }
 }
+
+/* Internal Alpha Miner Detail */
+.miner-detail-hero {
+    display: grid;
+    grid-template-columns: minmax(0, 1.4fr) minmax(220px, .8fr);
+    gap: 18px;
+    align-items: start;
+    border: 1px solid var(--line);
+    border-left: 5px solid var(--accent);
+    background: #fff;
+    padding: 18px;
+    margin-bottom: 16px;
+}
+
+.miner-detail-hero h2 { margin: 2px 0 5px; font-size: 24px; }
+.miner-detail-uuid { color: var(--muted); font-family: ui-monospace, monospace; font-size: 12px; overflow-wrap: anywhere; }
+.miner-detail-state { display: grid; gap: 6px; justify-items: start; }
+.miner-detail-state strong {
+    border: 1px solid var(--line);
+    border-left: 4px solid #596675;
+    padding: 8px 10px;
+    background: #f7f8f9;
+}
+.miner-detail-state strong[data-status="online"] { border-left-color: var(--success); }
+.miner-detail-state strong[data-status="offline"] { border-left-color: var(--danger); }
+.miner-detail-state strong[data-status="unstable"] { border-left-color: var(--warn); }
+.miner-detail-state strong[data-status="repair"] { border-left-color: #6b4ca5; }
+.miner-detail-actions {
+    grid-column: 1 / -1;
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+    padding-top: 12px;
+    border-top: 1px solid var(--line);
+}
+.miner-detail-actions .quiet-button { color: var(--ink); }
+
+.miner-detail-grid {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 16px;
+}
+
+.miner-detail-grid .panel { margin: 0 0 16px; }
+.metric-grid {
+    display: grid;
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+    gap: 8px;
+    margin: 0;
+}
+.metric-grid > div {
+    border: 1px solid var(--line);
+    border-left: 3px solid #7b8792;
+    padding: 9px 10px;
+    background: #f8f9fa;
+}
+.metric-grid dt { color: var(--muted); font-size: 12px; font-weight: 700; }
+.metric-grid dd { margin: 4px 0 0; font-size: 16px; font-weight: 800; overflow-wrap: anywhere; }
+.tag-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
+.tag { border: 1px solid #aeb8c2; background: #f4f6f7; padding: 3px 7px; font-size: 12px; }
+
+.disclosure-list { display: grid; gap: 9px; margin-top: 12px; }
+.disclosure-list details {
+    border: 1px solid var(--line);
+    background: #fff;
+}
+.disclosure-list summary {
+    cursor: pointer;
+    min-height: 44px;
+    padding: 11px 13px;
+    font-weight: 750;
+}
+.disclosure-list summary:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
+.lazy-content,
+.disclosure-list details > .definition-list,
+.disclosure-list details > .permission-note { padding: 0 13px 13px; }
+.repair-episode-summary { display: flex; justify-content: space-between; gap: 12px; }
+.repair-episode-summary .secondary { font-weight: 500; }
+.repair-timeline-list { display: grid; gap: 10px; padding-left: 24px; }
+.repair-timeline-list li { padding-left: 4px; }
+.repair-timeline-list li > span { display: block; margin-top: 3px; }
+.event-payload { margin-top: 7px; }
+.compact-history-table { margin-top: 8px; max-height: 420px; overflow: auto; }
+.compact-history-table th { position: sticky; top: 0; background: #eef1f3; }
+.permission-note { color: #5b466f; border-left: 4px solid #8b6cad; padding: 9px 11px; background: #f7f3fa; }
+.empty-copy { color: var(--muted); }
+
+@media (max-width: 820px) {
+    .miner-detail-hero,
+    .miner-detail-grid { grid-template-columns: 1fr; }
+    .miner-detail-actions { grid-column: 1; }
+}
+
+@media (max-width: 560px) {
+    .miner-detail-hero { padding: 13px; }
+    .metric-grid { grid-template-columns: 1fr; }
+    .miner-detail-actions > * { width: 100%; text-align: center; }
+    .repair-episode-summary { align-items: flex-start; flex-direction: column; }
+    .compact-history-table table { min-width: 620px; }
+}
+
+@media (prefers-reduced-motion: reduce) {
+    .miner-detail-hero *, .disclosure-list * { scroll-behavior: auto; }
+}