circle-play for the background job button, at full strength

White rather than muted, 18px rather than 16. Its neighbours on that row are
pickers — they report what is already selected — and this is the only control
there that does something, so it should not be wearing the same recessive grey
as a label.

The glyph was a radio tower, chosen because a play button implies one-shot. That
reasoning was too clever: most of what gets started here is a long-running
process, and a watcher is still something you press start on. Recognisable beats
precise at this size.

The dialog's own title icon changes with it. A button and the thing it opens
wearing different glyphs is a small lie about them being the same feature.

tsgo clean, frontend builds.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/workspaces/officerdev/src/apps/Chat/components/BackgroundJobDialog.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useState } from 'react';
-import { Radio } from 'lucide-react';
+import { CirclePlay } from 'lucide-react';
 import { Button } from '@/components/ui/button';
 import {
   Dialog,
@@ -87,7 +87,7 @@ export const BackgroundJobDialog = ({ open, onOpenChange, cwd, onSubmit }: Backg
       <DialogContent className="sm:max-w-lg">
         <DialogHeader>
           <DialogTitle className="flex items-center gap-2">
-            <Radio className="h-4 w-4" />
+            <CirclePlay className="h-4 w-4" />
             Background job
           </DialogTitle>
           <DialogDescription>

src/workspaces/officerdev/src/apps/Chat/components/ModelSelector.tsx

@@ -1,5 +1,5 @@
 import { useEffect } from 'react';
-import { Radio } from 'lucide-react';
+import { CirclePlay } from 'lucide-react';
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
 import type { ModelOption } from 'state/useModels';
 import { getProviderDisplayName } from 'state/useModels';
@@ -126,15 +126,21 @@ export function ModelSelector({
       )}
       {/* Background job. Sits between the harness (left) and the model (right), in the gap
           `justify-between` already leaves — session-level, like its neighbours, rather than about the
-          message being typed. `Radio` because it listens; a play button would imply one-shot. */}
+          message being typed.
+
+          Full-strength and a size up, unlike its muted neighbours: those are pickers reporting what is
+          already set, and this is the one control on this row that DOES something. The earlier glyph was
+          a radio tower, on the reasoning that a play button implies one-shot — but most of what gets
+          started here is a long-running process, and a watcher is still something you press start on.
+          Recognisable beats precise at 18px. */}
       {onBackgroundJob && (
         <button
           type="button"
           onClick={onBackgroundJob}
           title="Start a background job or watcher"
-          className="shrink-0 rounded-md p-1.5 text-muted-foreground transition-colors hover:bg-foreground/10 hover:text-foreground cursor-pointer"
+          className="shrink-0 cursor-pointer rounded-md p-1.5 text-foreground transition-colors hover:bg-foreground/10"
         >
-          <Radio className="h-4 w-4" />
+          <CirclePlay className="h-[18px] w-[18px]" />
         </button>
       )}
       {/* The thinking toggle used to render here. It is gone because it did nothing: `thinking` is