feat(timeline): full form UI with engine selection and advanced settings

Add 4-language switcher (EN/NO/UK/PL), engine choice (Azure mini/full,
GPU/cuttlefish), and expandable Advanced panel (Focus, Confidence filter,
Date types) to timeline.php. Wire new params through api/timeline.php and
LegalTools::timeline() with engine routing, focus-aware prompt injection,
and confidence/date-type post-filters. Add TIMELINE_I18N to tools.js with
improved renderTimeline() confidence colour-coding and new CSS classes.

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

assets/css/tools.css

@@ -362,25 +362,65 @@ p {
 .timeline-list {
   display: grid;
   gap: 10px;
-  padding-left: 20px;
+  padding-left: 0;
+  list-style: none;
 }
 
-.timeline-list li {
-  padding-left: 4px;
+.timeline-item {
+  padding: 10px 12px 10px 14px;
+  border-left: 4px solid var(--line);
+  border-radius: 0 6px 6px 0;
+  background: var(--bg-card, #fff);
 }
 
-.timeline-list span {
+.timeline-item.confidence-high { border-left-color: #16a34a; }
+.timeline-item.confidence-medium { border-left-color: #d97706; }
+.timeline-item.confidence-low { border-left-color: #9ca3af; opacity: 0.75; font-style: italic; }
+
+.timeline-header {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+  margin-bottom: 4px;
+}
+
+.timeline-date {
+  font-size: 0.95rem;
+}
+
+.timeline-actor {
   display: block;
   color: var(--teal-dark);
   font-weight: 700;
+  font-size: 0.85rem;
+  margin-bottom: 3px;
 }
 
-.timeline-list small {
+.timeline-event {
+  margin: 4px 0;
+}
+
+.timeline-excerpt {
   display: block;
   margin-top: 5px;
   color: var(--muted);
+  font-size: 0.82rem;
 }
 
+.confidence-badge {
+  font-size: 0.7rem;
+  font-weight: 600;
+  padding: 1px 6px;
+  border-radius: 999px;
+  text-transform: uppercase;
+  letter-spacing: 0.03em;
+  font-style: normal;
+}
+.confidence-badge--high { background: #dcfce7; color: #15803d; }
+.confidence-badge--medium { background: #fef3c7; color: #b45309; }
+.confidence-badge--low { background: #f3f4f6; color: #6b7280; }
+
 .redacted-output {
   max-height: 420px;
   overflow: auto;