Save button doesn't open the save modal sometimes

[fungairino]

Describe the bug

The save button re-mounts several times so we need to retry clicking the saveButton until the modal is visible in end to end tests.

For end users this means that sometimes clicking this button does nothing and they don't know why. This happens most often right after loading the page editor, but also just happens intermittently.

To Reproduce

Screen.Recording.2024-10-10.at.1.45.05.PM.mov

Expected behavior

The save button always works, or is disabled if it is not clickable yet.

Additional context

pixiebrix-extension/end-to-end-tests/pageObjects/pageEditor/pageEditorPage.ts

Line 166 in 18f7009

// The save button re-mounts several times so we need to retry clicking the saveButton until the modal is visible

[twschiller]

Related code?:

pixiebrix-extension/src/pageEditor/hooks/useSaveMod.ts

Line 196 in 6ee340c

message: "Mod definitions not loaded yet. Try again.",