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## Summary
This PR extends **Image Compare** browser tests, adds **stable
`data-testid` hooks** on `WidgetImageCompare.vue`, and aligns slider
interactions with the **same viewport element** used by
`useMouseInElement`, with **layout polling** to reduce flakes.
## What this PR does
- [x] Adds **`data-testid="image-compare-viewport"`** on the compare
area root (the `containerRef` div) so E2E targets the real slider hit
region instead of a long Tailwind class chain or the `<img>` box alone.
- [x] Adds **`data-testid="image-compare-empty"`** on the no-images
branch so the empty state can be asserted **without hard-coded English**
UI text.
- [x] Adds a **smoke** test that the widget **shows both images and the
drag handle** after value injection, with **`waitForImagesLoaded`** (no
extra full-node screenshot to avoid duplicating the default-50 golden).
- [x] Extends slider coverage to **clamp at both edges** (**0%** and
**~100%**) using the viewport locator and **`expect.poll`** until
**`boundingBox()`** is valid before reading coordinates.
- [x] Updates **`moveToPercentage`** to **`expect.poll`** until the
target locator has a **non-empty layout box** before moving the mouse.
- [x] Routes **hover**, **preserve position**, and **25% / 75%
screenshot** mouse moves through **`image-compare-viewport`**
(consistent with `containerRef`).
- [x] Adds an E2E assertion that the **workflow ImageCompare node** size
is **at least 400×350** (matches the widget workflow asset).
- [x] Hardens the **broken image** case: **`page.on('pageerror')`** /
**`page.off`** in **`finally`**, **`http://127.0.0.1:1/...`** URLs for
fast failure, **`expect.soft`** on key UI invariants, and a hard
assertion that **no page errors** were recorded.
- [x] Extends the **large batch (20×20)** test to **page to the last
index** and assert **counters `20 / 20`**, **previous enabled**, and
**next disabled** on both sides.
- [x] Renames the clamp test title to use an **ASCII hyphen** (`0-100%`)
for easier grepping.
## Out of scope (unchanged in this PR)
- [ ] Replacing **`setImageCompareValue`**’s **`page.evaluate`** setup
with a full UI-driven path (would be a larger follow-up).
## Suggested title
`test: expand Image Compare E2E and stabilize widget selectors`
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Primarily test and selector-hook changes; low production risk, with
only minor DOM attribute additions that could affect external test
tooling if relied upon.
>
> **Overview**
> Improves Image Compare Playwright coverage and reduces flakiness by
driving slider interactions through a new stable
`data-testid="image-compare-viewport"` hook and polling for a valid
layout box before mouse moves.
>
> Updates assertions to avoid localized text (new
`data-testid="image-compare-empty"`), adds smoke coverage that
images/handle render after value injection, validates slider clamping at
both 0% and ~100%, and extends screenshot tests to use the same viewport
target.
>
> Hardens edge-case tests by ensuring broken image loads don’t raise
uncaught `pageerror`s, adds a minimum node size assertion, and extends
large-batch navigation checks through the final index and
disabled/enabled nav states.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
ce3f7fbf8c. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-11196-test-expand-Image-Compare-E2E-and-stabilize-widget-selectors-3416d73d3650814d8d2bf207943d6205)
by [Unito](https://www.unito.io)