dashboard: 3-column layout — swarm / 0per4t0r 1n / m3ss4g3s

regroups the 7 stacked sections into three semantic columns
backed by a CSS grid (single column under 1400px, 3 columns
above). column headers are sticky so vertical scrolling
inside a column doesn't lose context.

- SW4RM (left, slightly wider): containers + kept-state +
  spawn-agent form + meta-input update form. all
  swarm-mutating operator knobs live here.
- 0PER4T0R 1N (middle): mind-questions + pending approvals.
  the two things waiting on operator action.
- M3SS4G3S (right): operator-inbox + msg-flow tail + the
  @-mention compose box. broker traffic in one place.

spawn form moves out of renderApprovals into static HTML
under sw4rm; renderApprovals no longer injects it.

cosmetic: per-section h2/divider replaced with smaller cyan
sub-heads + a dashed underline so each column reads as one
cohesive unit instead of seven competing banners. body
max-width grows 70em → 110em to actually use the new
horizontal real estate.

hive-c0re/assets/dashboard.css

@@ -18,11 +18,50 @@ body {
   background: var(--bg);
   color: var(--fg);
   font-family: "JetBrains Mono", "Fira Code", "Cascadia Code", "Source Code Pro", monospace;
-  max-width: 70em;
+  max-width: 110em;
   margin: 1.5em auto;
   padding: 0 1.5em;
   line-height: 1.6;
 }
+.columns {
+  display: grid;
+  gap: 1.4em;
+  margin-top: 1em;
+}
+@media (min-width: 1400px) {
+  .columns {
+    grid-template-columns: 1.1fr 1fr 1fr;
+    align-items: start;
+  }
+}
+.dash-col {
+  min-width: 0; /* lets grid children shrink instead of overflowing */
+}
+.col-head {
+  position: sticky;
+  top: 0;
+  z-index: 5;
+  background: rgba(30, 30, 46, 0.92);
+  -webkit-backdrop-filter: blur(6px);
+  backdrop-filter: blur(6px);
+  margin: 0 0 0.6em;
+  padding: 0.3em 0.5em;
+  font-size: 1em;
+  border-bottom: 1px solid var(--purple-dim);
+}
+.sub-head {
+  color: var(--cyan);
+  font-size: 0.85em;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+  margin: 1.6em 0 0.4em;
+  padding-bottom: 0.15em;
+  border-bottom: 1px dashed var(--border, var(--purple-dim));
+  text-shadow: 0 0 6px rgba(137, 220, 235, 0.35);
+}
+.dash-col .sub-head:first-of-type {
+  margin-top: 0.4em;
+}
 .banner {
   text-align: center;
   margin: 0 0 1em 0;
@@ -52,7 +91,7 @@ h1, h2 {
   color: var(--purple);
   text-transform: uppercase;
   letter-spacing: 0.15em;
-  margin-top: 2em;
+  margin-top: 1em;
   text-shadow: 0 0 8px rgba(203, 166, 247, 0.4);
 }
 .divider {