fix(tui): let only the dot carry background-task status

The started line rendered dot and wording in periwinkle and the completed
line rendered both in green, so an ambient background task drew as much
attention as the work the user asked for.

Keep the wording dim on every phase and colour the bullet alone: dim while
running, green on completion, red on failure.

Author: elkaix

apps/pythinker-code/src/tui/components/messages/background-agent-status.ts

@@ -15,17 +15,22 @@ export class BackgroundAgentStatusComponent implements Component {
     const safeWidth = Math.max(0, width);
     if (safeWidth <= 0) return [''];
 
-    const tone: keyof ColorPalette =
+    // Only the bullet carries the status. A background task is ambient — it is
+    // not what the user asked for — so the wording stays dim and the eye picks
+    // the line out by colour of the dot alone, never by a fully coloured line.
+    const bulletTone: keyof ColorPalette =
       this.data.phase === 'started'
-        ? 'primary'
+        ? 'textDim'
         : this.data.phase === 'completed'
           ? 'success'
           : 'error';
 
     const bullet =
-      this.data.phase === 'failed' ? currentTheme.fg(tone, FAILURE_MARK) : currentTheme.fg(tone, STATUS_BULLET);
+      this.data.phase === 'failed'
+        ? currentTheme.fg(bulletTone, FAILURE_MARK)
+        : currentTheme.fg(bulletTone, STATUS_BULLET);
     const text =
-      currentTheme.fg(tone, this.data.headline) +
+      currentTheme.fg('textDim', this.data.headline) +
       (this.data.detail !== undefined && this.data.detail.length > 0
         ? currentTheme.fg('textDim', ` (${this.data.detail})`)
         : '');

apps/pythinker-code/test/tui/components/messages/background-agent-status.test.ts

@@ -1,8 +1,10 @@
 import { visibleWidth } from '@earendil-works/pi-tui';
+import chalk from 'chalk';
 import { describe, expect, it } from 'vitest';
 
 import { BackgroundAgentStatusComponent } from '#/tui/components/messages/background-agent-status';
 import { STATUS_BULLET } from '#/tui/constant/symbols';
+import { currentTheme } from '#/tui/theme';
 
 function strip(text: string): string {
   return text.replaceAll(/\u001B\[[0-9;]*m/g, '');
@@ -45,6 +47,46 @@ describe('BackgroundAgentStatusComponent', () => {
     );
   });
 
+  it('colours only the bullet by phase and keeps the wording dim', () => {
+    const started = new BackgroundAgentStatusComponent({
+      phase: 'started',
+      headline: 'bash task started in background',
+      detail: 'E2E: contained brand mark',
+    });
+    const completed = new BackgroundAgentStatusComponent({
+      phase: 'completed',
+      headline: 'bash task completed in background',
+      detail: 'E2E: contained brand mark · exit 0',
+    });
+
+    // Colours are off by default under vitest, which would make every
+    // assertion below compare bare strings and pass for the wrong reason.
+    const previousLevel = chalk.level;
+    chalk.level = 3;
+    try {
+      const startedLine = started.render(120)[1] ?? '';
+      const completedLine = completed.render(120)[1] ?? '';
+
+      // A running task is ambient: dim dot, dim wording, no accent colour.
+      expect(startedLine).toContain(currentTheme.fg('textDim', STATUS_BULLET));
+      expect(startedLine).toContain(currentTheme.fg('textDim', 'bash task started in background'));
+      expect(startedLine).not.toContain(
+        currentTheme.fg('primary', 'bash task started in background'),
+      );
+
+      // Completion turns the dot green — and only the dot.
+      expect(completedLine).toContain(currentTheme.fg('success', STATUS_BULLET));
+      expect(completedLine).toContain(
+        currentTheme.fg('textDim', 'bash task completed in background'),
+      );
+      expect(completedLine).not.toContain(
+        currentTheme.fg('success', 'bash task completed in background'),
+      );
+    } finally {
+      chalk.level = previousLevel;
+    }
+  });
+
   it('keeps status lines within very narrow widths', () => {
     const component = new BackgroundAgentStatusComponent({
       phase: 'started',