🎨 Palette: Search panel accessibility improvements

[dezren39]

Added explicit aria-label attributes to the search/replace inputs and icon-only buttons (Previous, Next, Close) in the ProseMirror search panel. This improves screen reader accessibility by providing clear context that was previously missing or reliant only on visual titles. Also added a journal entry for Palette in .Jules/palette.md.

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PR created automatically by Jules for task 16591916159422473308 started by @dezren39

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