test(e2e): console transcript pinned to bottom on tab + submit

Adds server_with_console_history fixture (30 seeded CommandHistory rows)
and two Playwright tests that verify the inline Console transcript is
scrolled to its bottom when the Console tab is activated and after a
command is submitted.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

l4d2web/tests/e2e/conftest.py

@@ -269,3 +269,27 @@ def server_with_files(tmp_path, monkeypatch):
         }
     finally:
         shutdown()
+
+
+@pytest.fixture(scope="function")
+def server_with_console_history(server_with_files):
+    """server_with_files + 30 seeded CommandHistory rows for that server,
+    so the inline Console transcript exceeds its visible height and the
+    autoscroll behaviour is observable."""
+    from datetime import UTC, datetime, timedelta
+    from l4d2web.models import CommandHistory
+
+    sid = server_with_files["server_id"]
+    uid = server_with_files["user_id"]
+    with session_scope() as session:
+        for i in range(30):
+            session.add(CommandHistory(
+                user_id=uid,
+                server_id=sid,
+                command=f"seed_{i:02d}",
+                reply=f"reply {i}",
+                is_error=False,
+                created_at=datetime.now(UTC) - timedelta(minutes=35 - i),
+            ))
+
+    return server_with_files

l4d2web/tests/e2e/test_server_detail.py

@@ -108,3 +108,56 @@ def test_expand_opens_matching_modal(page: Page, server_with_files) -> None:
 
     dialog = page.locator("dialog#files-modal")
     expect(dialog).to_have_attribute("open", "")
+
+
+def test_console_tab_pinned_to_bottom_on_activation(page: Page, server_with_console_history) -> None:
+    """Clicking the Console tab leaves the transcript scrolled to its
+    bottom — the newest seeded command must be visible, not the oldest."""
+    base = server_with_console_history["base_url"]
+    sid = server_with_console_history["server_id"]
+    login(page, base)
+    page.goto(f"{base}/servers/{sid}")
+
+    strip = page.locator("[data-tab-strip]")
+    strip.locator('[role="tab"][data-tab="console"]').click()
+
+    transcript = page.locator(f"#console-transcript-inline-{sid}")
+    expect(transcript).to_be_visible()
+
+    bottom_distance = transcript.evaluate(
+        "(el) => el.scrollHeight - el.scrollTop - el.clientHeight"
+    )
+    assert abs(bottom_distance) < 2, f"transcript not pinned to bottom: {bottom_distance}px"
+
+    line_count = transcript.locator(".console-line").count()
+    assert line_count == 20, f"inline expected 20 lines, got {line_count}"
+
+
+def test_console_pane_pinned_after_command_submit(page: Page, server_with_console_history) -> None:
+    """After submitting a command, the transcript scrolls so the new line
+    is visible at the bottom.
+
+    The dev server has no live RCON, but the POST still records a
+    CommandHistory row and HTMX appends a console-line to the transcript;
+    that's enough to exercise the autoscroll path.
+    """
+    base = server_with_console_history["base_url"]
+    sid = server_with_console_history["server_id"]
+    login(page, base)
+    page.goto(f"{base}/servers/{sid}")
+
+    strip = page.locator("[data-tab-strip]")
+    strip.locator('[role="tab"][data-tab="console"]').click()
+
+    transcript = page.locator(f"#console-transcript-inline-{sid}")
+    pane = page.locator('[role="tabpanel"][data-tab="console"]')
+    cmd_input = pane.locator('input[name="command"]')
+    cmd_input.fill("verify_submit")
+    cmd_input.press("Enter")
+
+    expect(transcript.locator(".console-line", has_text="verify_submit")).to_be_visible()
+
+    bottom_distance = transcript.evaluate(
+        "(el) => el.scrollHeight - el.scrollTop - el.clientHeight"
+    )
+    assert abs(bottom_distance) < 2, f"transcript not pinned after submit: {bottom_distance}px"