frontend: finish the dashboard comment-density sweep

Continues #3901 (dashboard round 1 was #3906, tabs.js/swarm.js).
Scanned the rest of packages/dashboard/src for the same 'moved to X'/
'now lives in Y' pattern: five more hits in schedules.js, common.js,
logs.js (two, one duplicating the other), core.js, and swarm.js.
All trimmed to state the current location as a fact rather than
narrating the move; one inline duplicate (logs.js's tab-default
comment restating the file-header pointer) dropped outright.

frontend/packages/dashboard/src/swarm.js

@@ -543,7 +543,7 @@ function buildContainerLi(c, node, opts) {
   body.append(head);
 
   // Per-card action buttons (R3ST4RT / ST0P / ST4RT / R3BU1LD /
-  // DESTR0Y / PURG3) moved to the selection bar — see
+  // DESTR0Y / PURG3) live on the selection bar, not here — see
   // docs/web-ui.md::Selection bar. The contextual `needs update ↻`
   // chip in the head row stays — it's a state-hint, not an
   // action button.