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/lanes/LaneCard.tsx

@@ -1,12 +1,15 @@
 /**
- * @file One lane's card: progress bar, branch/CI/PR facts, the "needs you"
+ * @file One lane's card: branch/CI/PR facts, the "needs you"
  * banner sourced from Claude Code's Notification hook, and (for managed
  * lanes only) a ⋯ menu holding the rare `reset worktree` action behind
  * DestructiveLaneModal. A dead lane (its driving session went silent while
  * it should have been working) is called out loudly — that is the failure
  * this view exists to catch. Stage, kind, and the "auto: <stage>" chip are
  * NOT repeated here — this card only ever renders inside the Workspace
- * lane-detail section, whose header above it already shows them. The repo
+ * lane-detail section, whose header above it already shows them. Neither is
+ * progress: the pipeline map directly below this card draws the same number
+ * as named, coloured nodes, so a bar and a percent beside it were a worse
+ * second telling of it. The repo
  * card also carries the lane's AI Router picker — the Add-lane modal is the
  * only other place one is chosen, and a lane outlives its creation. The repo
  * tooling dropdown (`LaneToolsMenu`, exported from this file) and the
@@ -427,23 +430,6 @@ export default function LaneCard({
         data-testid={`lane-card-${lane.id}`}
         className="flex flex-col rounded-lg border border-border bg-surface-4 p-2.5 transition-colors hover:border-border-light"
       >
-        {/* Progress line: how far through the pipeline. The stage's own name
-            and how long it's been running are already in the Workspace
-            header above; not repeated here. Omitted at 0% — an empty bar
-            is not information, just a blank row above a dead/idle lane. */}
-        {lane.progress > 0 && (
-          <div className="mb-1.5 flex items-center gap-2 text-xs">
-            <div className="h-1 flex-1 overflow-hidden rounded-full bg-surface-2">
-              <div
-                data-testid="lane-progress-fill"
-                className="h-full rounded-full bg-blue-600 transition-[width]"
-                style={{ width: `${lane.progress}%` }}
-              />
-            </div>
-            <span className="tabular-nums text-fg-secondary">{lane.progress}%</span>
-          </div>
-        )}
-
         {(lane.ci_status || lane.tool === "codex") && (
           <div className="mb-2 flex flex-wrap items-center gap-1.5 text-[11px]">
             {lane.ci_status && (