fix: v2.3.1 — correct version, say why a plugin update failed, gitignored files in Files

- v2.3.0's tree reported 2.2.1, so every install saw an update forever;
  package.json, the lockfile, openapi.yaml, the CLAUDE.md marker and the
  snapshot now read 2.3.1
- A failed plugin-update step records the tail of the command's stdout and
  stderr plus its exit code or signal (failureText); plugin-bootstrap.js
  prints its refusal on stdout, which the verdict used to drop. Update all
  uses the same text
- updates.test.js never applies an update: it skips when the checkout is
  behind a release (apply ran npm run setup and pruned dev dependencies)
- Files tree lists gitignored files and folders, named in orange
  (addIgnored in git-diff.js); change-tree rows indent in whole steps

client/src/components/lanes/LaneChangesPanel.tsx

@@ -248,6 +248,7 @@ function TreeNodes({
               type="button"
               data-tree-status={mark?.letter ?? (e.changed ? "dir" : undefined)}
               data-tree-kept={isKept || undefined}
+              data-tree-ignored={e.ignored || undefined}
               onClick={() => (e.dir ? onToggleDir(e.path) : onOpenFile(e.path))}
               onContextMenu={onMenu && ((ev) => onMenu(ev, e))}
               style={{ paddingLeft: `${depth * 0.9 + 0.25}rem` }}
@@ -255,11 +256,13 @@ function TreeNodes({
               className={`flex w-full items-center gap-1 rounded px-1 py-0.5 text-left font-mono text-[11px] hover:bg-surface-2 ${
                 isKept
                   ? "bg-kept/10 text-kept"
-                  : mark
-                    ? mark.tone
-                    : e.changed
-                      ? "text-status-warning"
-                      : "text-fg-primary"
+                  : e.ignored
+                    ? "text-kept"
+                    : mark
+                      ? mark.tone
+                      : e.changed
+                        ? "text-status-warning"
+                        : "text-fg-primary"
               } ${active === e.path ? "!bg-surface-4" : ""}`}
             >
               {e.dir ? (
@@ -495,7 +498,9 @@ function ChangeRow({
   return (
     <li
       className="group flex items-baseline gap-1"
-      style={depth ? { paddingLeft: `${depth * 0.9}rem` } : undefined}
+      // A file has no chevron: reserve its 1rem so the letter lines up
+      // with a sibling folder's icon, one step inside the parent folder.
+      style={{ paddingLeft: `${depth + 1}rem` }}
       onContextMenu={(e) => onMenu(e, f)}
     >
       <button
@@ -571,10 +576,7 @@ function ChangeTreeNodes({
         const open = !collapsed.has(key);
         return (
           <li key={d.path}>
-            <div
-              className="group flex items-center gap-1"
-              style={{ paddingLeft: `${depth * 0.9}rem` }}
-            >
+            <div className="group flex items-center gap-1" style={{ paddingLeft: `${depth}rem` }}>
               <button
                 type="button"
                 aria-expanded={open}

client/src/lib/types.ts

@@ -2764,6 +2764,8 @@ export interface LaneTreeEntry {
   status?: string;
   /** A folder with a changed or untracked file anywhere under it. */
   changed?: true;
+  /** Ignored by git (`.gitignore`) — drawn orange in the Files tree. */
+  ignored?: true;
 }
 
 /** One row of a rendered diff — both gutters already resolved server-side. */

client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap

@@ -6913,7 +6913,7 @@ exports[`screen snapshots > Settings — about 1`] = `
             <p
               class="text-[10px] text-status-warning/90 mt-1"
             >
-              UI build v2.2.1 (rebuild client to match)
+              UI build v2.3.1 (rebuild client to match)
             </p>
           </div>
           <div