Hand over the whole item from the info panel

The panel is where you go to see exactly what the server said about a
video, and every time that is worth reporting somewhere it has to be
retyped from the screen. Copy JSON hands over the object instead: the
listing item, plus the extractor's payload once that has resolved.

What it copies is built where the rows are built, so the button and the
panel can't disagree about what "this video" means -- and it is the values
rather than the rendering, so a duration of 0 stays 0 instead of becoming
the panel's dash.

navigator.clipboard needs a secure context, which the app has on https and
does not on a plain-http LAN address, so the old execCommand path sits
behind it.

The test drives the real clipboard rather than the function, and the
awkward parts of a real item -- nested http_headers, a tag array, a zero,
an empty string -- are in the fixture for that reason. It and two others
also pick up smoke_grid's lean Chromium flags, without which they get
themselves killed when run alongside everything else.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MPZFnNdHbPGDTqQUNiE4ZN

tests/smoke_channels.py

@@ -73,7 +73,14 @@ def main():
     c = Checks()
     with sync_playwright() as p:
         browser = p.chromium.launch(args=[
-            "--no-sandbox", "--disable-dev-shm-usage", "--disable-gpu",
+            "--no-sandbox",
+            "--disable-dev-shm-usage",
+            "--disable-gpu",
+            # Lean flags, matching smoke_grid: this runs alongside the app's own
+            # server and a default Chromium spikes hard enough at startup to get
+            # itself killed on a constrained box.
+            "--renderer-process-limit=1",
+            "--js-flags=--max-old-space-size=512",
         ])
         page = browser.new_page(viewport={"width": 1400, "height": 1000})
         crashes = []