feat(lanes): reorder and rename lane cards, and show each file's line delta

The lane strip's tiles are now drag-reorderable (Alt+←/→ is the keyboard
path), and a lane's name can be set in place from the detail header. The
"Lane 23 ·" prefix is gone from both — the bare `#23` stays on the tile,
because that number is how the CLI addresses a lane.

Card order is a per-viewer preference, not a lane fact: it lives in
localStorage (`agenthub.workspace.laneOrder`) beside the split-view layout
and writes nothing server-side, so `GET /api/lanes` and `agenthub lanes`
keep answering in id order. Renaming is the opposite — it is PATCH
/api/lanes/:id with {title}, the one lane column a user now types into
directly.

That made a patch value reachable by hand for the first time, so
`bindable` now rejects any non-scalar for every PATCHABLE column with
EBADFIELD, and the route answers 400 for that and for the
SQLITE_CONSTRAINT family, rather than handing better-sqlite3 a datatype
throw and reporting 500 on plain bad input.

The uncommitted-files tooltip became a real panel. `GET /api/lanes/:id/git`
now returns `files` as {path, status, added, deleted} records — deltas from
one `git diff --numstat HEAD`, null where git has none to report (untracked,
binary, renamed) — and the card renders them portalled to the body, so the
Workspace's own scroll box cannot clip the list.

client/src/pages/Workspace.tsx

@@ -42,12 +42,18 @@
 
 import { useCallback, useEffect, useState, useSyncExternalStore } from "react";
 import { useTranslation } from "react-i18next";
-import { Plus, Square, Columns2, Grid2x2 } from "lucide-react";
+import { Plus, Square, Columns2, Grid2x2, Pencil } from "lucide-react";
 import { api } from "../lib/api";
 import type { CwdSuggestion, RunListResponse } from "../lib/api";
 import type { Lane, LaneFeature, ProofFeature, Session, WSMessage, LaneTool } from "../lib/types";
 import { eventBus } from "../lib/eventBus";
 import { keepIfSame } from "../lib/keepIfSame";
+import {
+  readLaneOrder,
+  writeLaneOrder,
+  sortByStoredOrder,
+  moveLane,
+} from "../lib/laneOrderStorage";
 import { LaneConsolePane } from "../components/run/LaneConsolePane";
 import PipelineMap from "../components/lanes/PipelineMap";
 import LaneCard, {
@@ -206,6 +212,9 @@ export function Workspace() {
   const [viewedFeature, setViewedFeature] = useState<LaneFeature | null>(null);
   const [proofFeatures, setProofFeatures] = useState<ProofFeature[]>([]);
   const [removeConfirmOpen, setRemoveConfirmOpen] = useState(false);
+  // Inline rename of the selected lane's title, in the detail header.
+  const [renamingLaneId, setRenamingLaneId] = useState<number | null>(null);
+  const [renameDraft, setRenameDraft] = useState("");
 
   // Run state kept at page level: shared across every pane, or drives the
   // lane strip itself rather than any one pane's form.
@@ -253,7 +262,10 @@ export function Workspace() {
   const refreshLanes = useCallback(async () => {
     try {
       const r = await api.lanes.list();
-      setLanes(keepIfSame(r.lanes));
+      // The `lanes` state IS the display order: the server answers in id order,
+      // the viewer's stored strip order is applied once here, and the in-place
+      // lane_update merge below preserves whatever order this produced.
+      setLanes(keepIfSame(sortByStoredOrder(r.lanes, readLaneOrder())));
       setSelectedLaneId((cur) =>
         cur !== null && r.lanes.some((l) => l.id === cur) ? cur : (r.lanes[0]?.id ?? null)
       );
@@ -472,6 +484,37 @@ export function Workspace() {
     }
   };
 
+  /**
+   * Move a lane card within the strip. Purely a viewer preference — it writes
+   * localStorage, never the lane row, so nothing the CLI or another session
+   * reads changes.
+   */
+  const handleLaneReorder = (from: number, to: number) => {
+    if (from === to || from < 0 || to < 0 || from >= lanes.length || to >= lanes.length) return;
+    const ids = moveLane(
+      lanes.map((l) => l.id),
+      from,
+      to
+    );
+    writeLaneOrder(ids);
+    setLanes(sortByStoredOrder(lanes, ids));
+  };
+
+  /** Commit an inline lane rename. An empty name clears the title, which puts
+   *  the cwd back in its place (`lane.title || lane.cwd` everywhere). */
+  const commitRename = async (id: number) => {
+    const title = renameDraft.trim();
+    setRenamingLaneId(null);
+    const lane = lanes.find((l) => l.id === id);
+    if (!lane || title === (lane.title || "")) return;
+    try {
+      await api.lanes.update(id, { title });
+      await refreshLanes();
+    } catch (err) {
+      setLaneActionError(err instanceof Error ? err.message : tLanes("actionErrorUnknown"));
+    }
+  };
+
   // Mirrors `agenthub lanes pipeline <template> <id>`: same PATCH, same
   // stage-mismatch warning when the current declared stage matches no node
   // in the newly chosen template.
@@ -524,12 +567,14 @@ export function Workspace() {
             <Plus className="h-4 w-4" />
             {tLanes("add")}
           </button>
-          {lanes.map((l) => (
+          {lanes.map((l, i) => (
             <LaneStripCard
               key={l.id}
               lane={l}
+              index={i}
               selected={selectedLaneId === l.id}
               onSelect={() => setSelectedLaneId(l.id)}
+              onReorder={handleLaneReorder}
             />
           ))}
           {!lanes.length && (
@@ -568,15 +613,47 @@ export function Workspace() {
                   ? tLanes("statusDead")
                   : tLanes(`status.${currentLane.status}`, { defaultValue: currentLane.status })}
               </span>
-              <span
-                className="min-w-0 truncate text-sm font-semibold text-fg-primary"
-                title={currentLane.cwd}
-              >
-                {tLanes("laneHeader", {
-                  id: currentLane.id,
-                  title: currentLane.title || currentLane.cwd,
-                })}
-              </span>
+              {/* The lane's name, and the one place it can be set. No "Lane 23 ·"
+                  prefix any more: the id is on the strip tile, where the CLI's
+                  `--lane` reader looks for it, and repeating it here only ate
+                  the width the name needed. Submitting an empty name clears
+                  `title`, which puts the cwd back in its place. */}
+              {renamingLaneId === currentLane.id ? (
+                <input
+                  data-testid="lane-rename-input"
+                  aria-label={tLanes("renameLabel")}
+                  autoFocus
+                  value={renameDraft}
+                  onChange={(e) => setRenameDraft(e.target.value)}
+                  // Blur CANCELS, it does not save — same convention as the
+                  // rename field in CcConfig. Committing here too would fire
+                  // the PATCH twice for one Enter: the commit unmounts the
+                  // focused input, and removing a focused element raises a
+                  // native blur before the refetch has moved `lanes`, so the
+                  // "unchanged title" guard would not catch the second call.
+                  onBlur={() => setRenamingLaneId(null)}
+                  onKeyDown={(e) => {
+                    if (e.key === "Enter") void commitRename(currentLane.id);
+                    if (e.key === "Escape") setRenamingLaneId(null);
+                  }}
+                  maxLength={200}
+                  className="min-w-0 flex-1 rounded border border-accent bg-surface-1 px-2 py-0.5 text-sm font-semibold text-fg-primary"
+                />
+              ) : (
+                <button
+                  type="button"
+                  data-testid="lane-rename"
+                  onClick={() => {
+                    setRenameDraft(currentLane.title || "");
+                    setRenamingLaneId(currentLane.id);
+                  }}
+                  title={`${currentLane.cwd}\n${tLanes("renameLabel")}`}
+                  className="group flex min-w-0 items-center gap-1 text-sm font-semibold text-fg-primary"
+                >
+                  <span className="min-w-0 truncate">{currentLane.title || currentLane.cwd}</span>
+                  <Pencil className="h-3 w-3 shrink-0 text-fg-muted opacity-0 transition-opacity group-hover:opacity-100" />
+                </button>
+              )}
               <span className="shrink-0 tabular-nums text-xs text-fg-muted">
                 {since(currentLane.stage_seconds)}
               </span>