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feat(v0.4): session manager grid with live preview thumbnails

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The flat session list didn't tell you what each session was doing. Rebuild
/manage.html as a full-page grid where each card renders a LIVE preview
thumbnail — a read-only xterm showing the session's actual current screen,
scaled down like a screenshot — so you can recognize each at a glance.

- RingBuffer.tail(maxBytes): newest scrollback on chunk boundaries (no ANSI/UTF-8
  split); GET /live-sessions/:id/preview returns {cols,rows,data} (no attach, so
  it doesn't inflate watcher counts or keep sessions alive)
- manage.ts: card grid; per card a scaled read-only Terminal renders CLEAR+tail,
  auto-refresh every 4s, click thumbnail/Open to join, Kill / bulk kill
- bundles xterm into manage.js (+manage.css linked in manage.html)
- ring-buffer tail tests

Verified: 3 sessions rendered as recognizable thumbnails (top / git log / ls),
colored, with status/age; click opens. 228 tests green, tsc clean.
This commit is contained in:
Yaojia Wang
2026-06-19 11:37:32 +02:00
parent 199e29d15b
commit 787f806e02
7 changed files with 278 additions and 87 deletions
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public/manage.html
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@@ -5,6 +5,7 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
<title>Session Manager — Web Terminal</title>
<meta name="theme-color" content="#0e0f13">
<link rel="stylesheet" href="./build/manage.css">
<link rel="stylesheet" href="./style.css">
</head>
<body>