feat(web): lamp-only header on the content width

Drops #master-verdict entirely - element, .rail-verdict rules and every
line that wrote into it. The lamp is the only header signal; the
unreachable detail moves onto the board's arr module so nothing is lost.
Rail contents move into .rail-inner capped at the deck's 68rem and
centred, leaving the panel full-bleed.

Committed by the blitz orchestrator: the authoring session wedged with
the work complete on disk and stopped accepting input.

web/src/style.css

@@ -136,15 +136,22 @@ body {
 /* ---- rails ---------------------------------------------------------- */
 
 .rail {
-  display: flex;
-  align-items: center;
-  gap: var(--space-6);
   padding: var(--space-3) var(--space-6);
   border-bottom: 1px solid var(--line);
   background: var(--panel);
   box-shadow: inset 0 1px var(--highlight);
 }
 
+/* contents share the deck's column; the panel itself stays full-bleed */
+.rail-inner {
+  display: flex;
+  align-items: center;
+  gap: var(--space-6);
+  width: 100%;
+  max-width: 68rem;
+  margin-inline: auto;
+}
+
 .rail-id {
   display: flex;
   align-items: center;
@@ -160,24 +167,6 @@ body {
   line-height: 1;
 }
 
-.rail-verdict {
-  margin: 0;
-  flex: 1;
-  color: var(--ink-muted);
-}
-
-.rail-verdict[data-tone="ok"] {
-  color: var(--signal-ok);
-}
-
-.rail-verdict[data-tone="warn"] {
-  color: var(--signal-warn);
-}
-
-.rail-verdict[data-tone="fault"] {
-  color: var(--signal-fault);
-}
-
 .rail-meta {
   display: flex;
   align-items: center;
@@ -1770,7 +1759,7 @@ body {
 /* ---- small screens --------------------------------------------------- */
 
 @media (max-width: 46rem) {
-  .rail {
+  .rail-inner {
     flex-wrap: wrap;
     gap: var(--space-3) var(--space-4);
   }
@@ -1788,11 +1777,6 @@ body {
     white-space: nowrap;
   }
 
-  .rail-verdict {
-    flex-basis: 100%;
-    order: 3;
-  }
-
   .rail-search {
     order: 4;
     flex-basis: 100%;