feat: rich Rspamd history viewer with score badges and symbol details

- Rspamd log type renders a structured table instead of raw JSON
- Each row shows: timestamp, sender, recipient, subject, colour-coded
  score (green/amber/red relative to required threshold), action badge
- Expand button reveals a detail panel per message with:
  - Meta grid: Sender SMTP/MIME, IP, size, process time, Message-ID
  - Threshold strip showing all configured score boundaries
  - Symbol table sorted by impact, with dashicons (warning/check/minus),
    +/- score in colour, description, and option values
  - Zero-score informational symbols shown dimmed at the bottom
- Other log types (postfix, dovecot, etc.) still render as before

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

assets/css/woocow.css

@@ -418,6 +418,85 @@
     color: #fff;
 }
 
+/* ── Rspamd history viewer ───────────────────────────────────── */
+.woocow-badge-blue   { background: #cce5ff; color: #004085; }
+.woocow-badge-orange { background: #fff3cd; color: #856404; }
+.woocow-badge-red    { background: #f8d7da; color: #721c24; }
+
+.woocow-rspamd-table th,
+.woocow-rspamd-table td { vertical-align: middle; }
+.woocow-rspamd-table .woocow-actions { white-space: nowrap; }
+
+.woocow-score {
+    display: inline-block;
+    padding: 2px 7px;
+    border-radius: 4px;
+    font-family: monospace;
+    font-weight: 700;
+    font-size: 12px;
+    white-space: nowrap;
+}
+.woocow-score-clean { background: #d4edda; color: #155724; }
+.woocow-score-low   { background: #fff3cd; color: #856404; }
+.woocow-score-high  { background: #f8d7da; color: #721c24; }
+
+/* Rspamd detail panel */
+.woocow-rspamd-detail td { padding: 0 !important; background: #f9fafc !important; }
+.woocow-rspamd-symbols {
+    padding: 14px 20px;
+    border-top: 2px solid #e0e4ea;
+}
+.woocow-rspamd-meta {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+    gap: 8px 16px;
+    margin-bottom: 12px;
+    padding: 10px 0;
+    border-bottom: 1px solid #e8e8e8;
+}
+.woocow-rspamd-meta-item label {
+    display: block;
+    font-size: 10px;
+    font-weight: 700;
+    text-transform: uppercase;
+    color: #999;
+    margin-bottom: 2px;
+}
+.woocow-rspamd-meta-item {
+    font-size: 12px;
+    word-break: break-all;
+}
+.woocow-rspamd-thresholds {
+    font-size: 11px;
+    color: #888;
+    margin: 4px 0 10px;
+}
+.woocow-rspamd-sym-table {
+    width: 100%;
+    border-collapse: collapse;
+    font-size: 12px;
+}
+.woocow-rspamd-sym-table th {
+    background: #f0f1f5;
+    padding: 5px 8px;
+    text-align: left;
+    font-weight: 700;
+    border-bottom: 1px solid #dde;
+    white-space: nowrap;
+}
+.woocow-rspamd-sym-table td {
+    padding: 4px 8px;
+    border-bottom: 1px solid #eef;
+    vertical-align: top;
+}
+.woocow-rspamd-sym-table tr:hover td { background: #f5f7ff; }
+.woocow-rspamd-sym-table tr.sym-zero td { opacity: .55; }
+
+.woocow-sym-score-pos { color: #c0392b; font-weight: 700; }
+.woocow-sym-score-neg { color: #27ae60; font-weight: 700; }
+.woocow-sym-score-zero { color: #aaa; }
+.woocow-sym-name code { font-size: 11px; background: none; padding: 0; }
+
 /* ── Spam filter panel ───────────────────────────────────────── */
 .woocow-spam-panel { font-size: 13px; }
 .woocow-spam-panel input[type=range] { vertical-align: middle; }