refactor(run): drop the lane progress bar, iconify pane layout, and one-row the run setup

Four more spots that spent height saying what was already visible or
saying too much of it.

**LaneCard** drops the progress bar and percent entirely — the pipeline
map right below the card already draws the same number as named,
coloured nodes, and a bar beside it was a worse second telling of it.

**SplitLayoutToggle** (Workspace) swaps "1 pane" / "2 pane" / "4 pane"
text buttons for the conventional square / two-column / 2x2-grid icons
(`Square`, `Columns2`, `Grid2x2`) most apps use for this. The words move
to `aria-label` and `title` rather than disappearing.

**RunSetup** merges the fresh/resume source picker onto the same row as
the Working directory / Model / Permission mode / Thinking effort fields
instead of a second row above them — settings left, New/Resume session
right. The session picker for an active resume still gets its own row
below, since it only appears in that one state.

**LaneConsolePane**'s "Run Claude" header goes from a two-row title +
wrapped blurb to one row (smaller icon and title), and the blurb itself
is trimmed to one short sentence, hidden below `sm` where it would wrap
again anyway.

`docs/LANES.md` updated to match (split-view description, lane-card
field list, and `agenthub stage`'s progress-bar wording).

Verification: `tsc --noEmit` clean, `npx vitest run` 508/508 (2 stale
progress-bar assertions in LaneCard.test.tsx replaced with one asserting
the bar is gone), `npm run build` clean, screens.snapshot diff reviewed
before regenerating (icon buttons + new blurb + reordered DOM only), file
headers audit clean.

client/src/components/run/LaneConsolePane.tsx

@@ -426,13 +426,17 @@ export function LaneConsolePane({
         </select>
       )}
 
-      <header className="flex items-start gap-3">
-        <div className="w-9 h-9 rounded-xl bg-accent/15 flex items-center justify-center flex-shrink-0">
-          <Play className="w-4.5 h-4.5 text-accent" />
+      {/* Title, live badge and blurb on ONE line: the blurb is a standing
+          description of the panel, not a message, so it does not earn the
+          second row it used to wrap onto. It drops out entirely below `sm`,
+          where the width would wrap it again. */}
+      <header className="flex items-center gap-2.5">
+        <div className="w-7 h-7 rounded-lg bg-accent/15 flex items-center justify-center flex-shrink-0">
+          <Play className="w-3.5 h-3.5 text-accent" />
         </div>
-        <div className="min-w-0 flex-1">
-          <div className="flex items-center gap-2">
-            <h1 className="text-lg font-semibold text-fg-primary">
+        <div className="flex min-w-0 flex-1 items-center gap-2">
+          <div className="flex shrink-0 items-center gap-2">
+            <h1 className="text-base font-semibold text-fg-primary">
               {t("title", { tool: toolLabel })}
             </h1>
             {wsConnected ? (
@@ -447,7 +451,9 @@ export function LaneConsolePane({
               </span>
             )}
           </div>
-          <p className="text-xs text-fg-muted max-w-3xl">{t("subtitle", { tool: toolLabel })}</p>
+          <p className="hidden min-w-0 truncate text-[11px] text-fg-muted sm:block">
+            {t("subtitle", { tool: toolLabel })}
+          </p>
         </div>
         <ActiveRunsSwitcher
           activeRuns={activeRuns}