test(e2e): layout samples, index-page links, and sturdier picture checks on the panel

[leaiss]

What

A follow-up to #151, still test/e2e/samples-panel.e2e.mjs (npm run test:e2e:samples-panel).

1. The layout samples on the panel (LOXR-828), browser 1.5.4:

Sample	What the test checks	Result
composition	Case 01's tile is scrolled into view first: at the top of the page every tile is below the fold, so the browser rightly weaves nothing. The header cycles frosted → solid → opaque → frosted, and the case-05 page modal opens over a tile and dismisses. It also reports any case the sample marks broken (none).	PASS
wall-3d	Fast-scroll stress. Right after a 1,894 px scroll, none of the 20 fully visible tiles shows a raw pair or black. 2.5 s later, 25 tiles are woven with real stereo pairs.	PASS
windows	One weave rect per window (5 photos, the video, the scene). The video window keeps changing on screen (40.4) while a photo does not (0.9).	PASS
links	Every link on the samples index page must open: 27 links, all 200. A missing page or repo reports 404.	PASS

2. Sturdier picture checks (these apply to every sample):

• Stale dumps: the service always writes the same three dump file names. So a stale copy, from an earlier dump or another tool, could be analysed as this one, or the input copied before it was written. Old copies are now cleared first, and the test waits for the service's own wrote line for each file of this submit.
• Screen timing: the screen is grabbed at the moment of the dump, so animated pages (a spinning model, a moving call test pattern) are compared with what was actually submitted.
• Double detection: a double is now a shifted copy of the halves that beats a mirror match by 0.3. A symmetric crate seen face-on matched 0.83 as a copy but 0.87 as a mirror; the 8 Oct doubles beat the mirror by 0.64–0.72. All 15 labelled grabs are still classified correctly.
• Mixed pages (stereo pictures plus live windows) allow identical eyes only on the live windows, and only when nobody is tracked.
• Still pages: a 1 px scroll nudge makes a still page submit a frame.

Full run, unattended, against the live site (14 checks)

• 13 pass: hello-cube, model, splat, camera-rig, display-modes (it now reads the panel at page load: the test(e2e): 3D scene samples on a real panel + display-modes startup read fix #151 fix is live), player, shopify, demo-gallery, call, composition, wall-3d, windows, links.
• 1 fails: call-embed, reported rather than hidden. With a side-by-side camera, its self tile shows a "You · 3D" badge but submits the left eye in both halves: only 0.05–0.10% of pixels differ. The source pair differs on 37.6% of pixels, at exactly the 40 px shift. For comparison, call with openCamera(synthetic) submits a real pair (54%). It is either <dxr-call>'s auto-detected stereo camera taking a mono path, or a mono self-view by design. That is a question for the SDK.

The samples that render live only need two different eyes with VIEWER=present (someone in front of the panel). Unattended, the runtime gives both eyes one viewpoint.

🤖 Generated with Claude Code

https://claude.ai/code/session_0122B8TjqkRgdikyu3edTegH