fix(changes): long branch name truncates; armed Discard matches the row icons

The branch name was shrink-0, so a long one ran over the head sha and the
action icons. It now truncates after the commit subject (full name in the
tooltip). The armed per-file Discard is the trash icon plus a small red
word on a faint tint, sized like its neighbours, instead of a bordered chip.

client/src/components/lanes/LaneChangesPanel.tsx

@@ -489,8 +489,9 @@ function FileActions({
           title={t("changes.discardConfirm")}
           disabled={busy}
           onClick={() => onAct("discard", f.path, true)}
-          className={`${HUNK_CHIP} border-status-danger bg-status-danger/20 text-status-danger`}
+          className="flex shrink-0 items-center gap-1 rounded bg-status-danger/10 px-1 py-0.5 text-[11px] leading-3 text-status-danger hover:bg-status-danger/20 disabled:opacity-40"
         >
+          <Trash2 className="h-3 w-3" />
           {t("changes.discardShortConfirm")}
         </button>
       ) : (

client/src/components/lanes/LaneGitHeader.tsx

@@ -373,12 +373,17 @@ export function LaneGitHeader({
         className="flex min-w-0 flex-1 items-baseline gap-1.5 font-mono text-[11px]"
         title={`${git.head} ${git.subject}`}
       >
-        <span className="flex shrink-0 items-center gap-1 self-center font-semibold text-fg-primary">
-          <GitBranch className="h-3 w-3 text-fg-muted" />
-          {git.branch}
+        {/* A long branch name truncates too (after the subject has gone),
+            or it overflowed onto the head and the action icons. */}
+        <span
+          className="flex min-w-[5rem] items-center gap-1 self-center font-semibold text-fg-primary"
+          title={git.branch}
+        >
+          <GitBranch className="h-3 w-3 shrink-0 text-fg-muted" />
+          <span className="truncate">{git.branch}</span>
         </span>
         <span className="shrink-0 text-fg-muted">{git.head}</span>
-        <span className="min-w-0 truncate text-fg-muted">{git.subject}</span>
+        <span className="min-w-0 shrink-[999] truncate text-fg-muted">{git.subject}</span>
       </div>
     </>
   );