fix: the running-stream banner's width and drop its status line

[anderson-oki]

The running-stream banner is a top safeAreaInset on the catalog page's scroll view, and that
region is the scroll view's frame. A ScrollView is as wide as its widest content — a rail still
on its skeleton runs past the window — so the banner was laid out centred on that inflated width
and only its right-hand end was on screen. The page now clamps the scroll view to the page width,
the same way the hero and the session banner already clamp their own.

The banner also drops its "Playing in its own window" line, which restated where the stream plays.
Both catalog status banners now share one chrome view instead of duplicating it.

Closes NEC-74

[coderabbitai]

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OpenNOW benchmark results

swift run OpenNOWBenchmarks all on fix/nec-74-running-stream-banner-width at 0f294127b554.

Informational only, not a merge gate. These timings come from a shared CI runner and move
between runs, so this comment claims no regression: there is no stable baseline to compare
against yet. Gating starts only once that baseline exists (Phase 0, P0-2).

Package	Operation	N	Iterations	Mean (ms)	Min (ms)	Max (ms)
OPN.GameServices	JSONDecoder.decode([OPNGameInfo])	96	25	6.483	5.265	9.218
OPN.GameServices	JSONEncoder.encode([OPNGameInfo])	96	25	5.012	4.186	8.663
OPN.GameServices	OPNCatalogGameObject init map	96	50	0.222	0.179	0.273
OPN.GameServices	OPNCatalogGameObject swiftValue map	96	50	0.249	0.215	0.306
OPN.GameServices	OPNCatalogPanelObject init map	96	50	0.760	0.594	1.814
OpenNOW	CatalogViewModel.catalogSections equivalent	96	500	0.006	0.004	0.120
OpenNOW	CatalogViewModel.marqueeGames equivalent	96	500	0.046	0.040	0.086
OpenNOW	selected detail section scan equivalent	96	2000	0.011	0.010	0.087
OpenNOW	best image URL derivation equivalent	96	500	0.116	0.106	0.203
OPN.GameServices	JSONDecoder.decode([OPNGameInfo])	500	25	30.577	25.988	40.309
OPN.GameServices	JSONEncoder.encode([OPNGameInfo])	500	25	25.253	23.177	32.000
OPN.GameServices	OPNCatalogGameObject init map	500	50	1.198	1.065	1.773
OPN.GameServices	OPNCatalogGameObject swiftValue map	500	50	1.422	1.160	2.603
OPN.GameServices	OPNCatalogPanelObject init map	500	50	1.103	1.012	1.311
OpenNOW	CatalogViewModel.catalogSections equivalent	500	500	0.006	0.004	0.016
OpenNOW	CatalogViewModel.marqueeGames equivalent	500	500	0.120	0.101	0.177
OpenNOW	selected detail section scan equivalent	500	2000	0.023	0.017	0.433
OpenNOW	best image URL derivation equivalent	500	500	0.717	0.562	1.673
OPN.GameServices	JSONDecoder.decode([OPNGameInfo])	1500	25	94.037	86.465	110.869
OPN.GameServices	JSONEncoder.encode([OPNGameInfo])	1500	25	74.630	67.917	93.050
OPN.GameServices	OPNCatalogGameObject init map	1500	50	4.194	3.226	6.904
OPN.GameServices	OPNCatalogGameObject swiftValue map	1500	50	3.956	3.448	5.925
OPN.GameServices	OPNCatalogPanelObject init map	1500	50	2.781	2.126	5.276
OpenNOW	CatalogViewModel.catalogSections equivalent	1500	500	0.005	0.004	0.017
OpenNOW	CatalogViewModel.marqueeGames equivalent	1500	500	0.267	0.218	0.406
OpenNOW	selected detail section scan equivalent	1500	2000	0.048	0.039	0.126
OpenNOW	best image URL derivation equivalent	1500	500	2.086	1.670	4.539
OPN.GameServices	JSONDecoder.decode([OPNGameInfo])	3000	25	176.262	164.609	194.482
OPN.GameServices	JSONEncoder.encode([OPNGameInfo])	3000	25	143.695	128.319	159.581
OPN.GameServices	OPNCatalogGameObject init map	3000	50	7.289	6.620	10.716
OPN.GameServices	OPNCatalogGameObject swiftValue map	3000	50	8.597	7.729	12.101
OPN.GameServices	OPNCatalogPanelObject init map	3000	50	2.874	2.540	8.343
OpenNOW	CatalogViewModel.catalogSections equivalent	3000	500	0.005	0.004	0.017
OpenNOW	CatalogViewModel.marqueeGames equivalent	3000	500	0.266	0.229	0.532
OpenNOW	selected detail section scan equivalent	3000	2000	0.050	0.039	0.250
OpenNOW	best image URL derivation equivalent	3000	500	4.516	3.893	8.075
OPN.Common	OPNStreamPreferences.loadDeviceCapabilities	n/a	200	0.512	0.120	55.905
OPN.Common	OPNStreamPreferences.loadMicrophoneDeviceOptions	n/a	100	0.002	0.000	0.142
OPN.Common	OPNStreamPreferences.loadProfile/effectiveProfile	n/a	1000	0.548	0.394	1.520

Full JSON: opennow-benchmarks artifact in this workflow run — one file per audit
(benchmark-catalog.json, benchmark-stream-preferences.json). The same JSON is printed in the
Run benchmark suite job log, which outlives the artifact.

_{Updated in place on every benchmark run for this PR.}