Add integration_test case: image intrinsic height drives container

[beaucollins]

Adds an apps/integration_test case that documents a web-renderer regression on this branch (#148): an <image> sized width:"100%" with no explicit height does not give its auto-height container any height. The image decodes but the container collapses to ~0, so the image is invisible.

Root cause

src/valdi_modules/src/valdi/web_renderer/src/elements/ImageElement.ts (~L412/L435) sets the inner <img>/canvas to position: absolute, so it contributes no intrinsic height to the wrapper; with no explicit height the wrapper stays auto → 0. Native (and the previous web renderer, where the <img> was in flow) size the container from the image aspect ratio.

Repro

Case image-intrinsic-height-container renders an intrinsic-ratio image in an auto-height card and records decode/asset observations. Web snapshot = a thin empty bar; native renders the image at its aspect-ratio height. The web-vs-native diff fails.

Suggested fix

Give the wrapper an intrinsic height from the decoded aspect ratio when no explicit height is set (or keep the inner <img> in flow for that case).

This case passes once the wrapper takes the image's intrinsic height.

[github-actions]

📊 PR Size: size/S

Total changes: 23 lines (1 files)

Top files changed:

• apps/integration_test/src/valdi/integration_test_app/src/IntegrationTestCases.tsx: +23 -0

_{Size calculated as additions + deletions. Labels: XS (<10), S (<50), M (<250), L (<1000), XL (1000+)}