fix(kanban-dashboard): make Orchestration mode checkbox label static

The checkbox label echoed its state ("Auto (default)" / "Manual") instead
of describing the action, so a checked box reading "Auto" parsed as a
status indicator rather than a control. The accompanying sub-description
was also static and started with "When on, ...", which read awkwardly
when the box was unchecked.

Replace the dynamic label with a static action label
("Auto-decompose triage tasks") and flip the sub-description between the
two modes so it stays accurate either way. The top-of-page Orchestration
pill is unchanged — that one is intentionally a status badge / toggle.

Fixes #28178

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plugins/kanban/dashboard/dist/index.js

@@ -1593,10 +1593,12 @@
                   saveSettings({ auto_decompose: !!e.target.checked });
                 },
               }),
-              settings.auto_decompose ? "Auto (default)" : "Manual",
+              "Auto-decompose triage tasks",
             ),
             h("div", { className: "text-[10px] text-muted-foreground" },
-              "When on, the dispatcher decomposes new triage tasks automatically."),
+              settings.auto_decompose
+                ? "The dispatcher decomposes new triage tasks automatically."
+                : "Triage tasks stay in triage until you click ⚗ Decompose."),
           ),
         ) : h("div", { className: "text-xs text-muted-foreground" },
           "Loading…"),