fix(builds): add missing start/stop/graceful_stop kind glyphs to QUEUE_KIND_GLYPH

The QueueKind enum has graceful_stop, start, and stop variants but the
dashboard QUEUE_KIND_GLYPH map only covered rebuild/meta_update/spawn/
destroy/restart/startup_sweep/perm_change — the three missing kinds
rendered as '?' in the build queue UI.

This became visible with the deferred start-after-rebuild change: a fast-lane
Start entry now appears as a child of its Rebuild parent, but showed the
fallback '?' glyph.

Glyphs assigned: graceful_stop=⏹, start=▶, stop=■.

Also update the dashboard.md kind-glyph list to include all nine kinds and
note that deferred start-after-rebuild entries also use parent_id grouping.

docs/web-ui/dashboard.md

@@ -155,11 +155,14 @@ operations: rebuilds, meta-update cascades, and first-spawns.
 One operation runs at a time; the worker drains FIFO. Each row
 shows a state glyph (`⏸` queued / `▶` running / `✔` done /
 `✖` failed / `⊘` cancelled), kind glyph + verb (`↻ rebuild`,
-`◆ meta_update`, `✨ spawn`, `🗑 destroy`), agent name, source
+`◆ meta_update`, `✨ spawn`, `🗑 destroy`, `↺ restart`,
+`⚡ startup_sweep`, `🔑 perm_change`, `⏹ graceful_stop`,
+`▶ start`, `■ stop`), agent name, source
 chip (`manual | meta_update | auto_update | crash_recover | approval`
 — green for operator-approved config changes), timing, and an
-optional reason / error. Meta-update cascade rebuilds nest under
-their parent entry (`parent_id` grouping; `rqe-child` CSS class).
+optional reason / error. Meta-update cascade rebuilds and deferred
+start-after-rebuild follow-ups nest under their parent entry
+(`parent_id` grouping; `rqe-child` CSS class).
 Dedup: re-enqueueing a still-queued op for the same agent
 collapses into the existing entry. All timing labels stay live:
 running entries tick elapsed seconds every second; queued and

frontend/packages/dashboard/src/builds.js

@@ -128,6 +128,9 @@ const QUEUE_KIND_GLYPH = {
   restart: '↺',
   startup_sweep: '⚡',
   perm_change: '🔑',
+  graceful_stop: '⏹',
+  start: '▶',
+  stop: '■',
 };
 const QUEUE_STATE_GLYPH = {
   queued: '⏸',