fix(app): browse subfolders in the open project dialog - #42786

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AI code review — automated review for reference; please use your judgment.

Scope: web directory picker gains a chevron to enter subfolders plus an up-level button next to the search box; desktop tree picker untouched.

• Verified both new i18n keys (dialog.directory.parent, common.open) already exist across locales, so no missing-translation fallout despite only one file changing.
• The chevron correctly stopPropagation()s so row-click selection still works; Windows drive normalization via normalizePickerDrive is reused rather than reimplemented — good.
• CI risk: the file now lacks a trailing newline at EOF (\ No newline at end of file), which will likely fail the repo's prettier/format checks. Worth fixing before merge.
• Accessibility: the chevron is a <span role="button" tabindex={-1}> with click-only handling — keyboard users can't enter a folder. Consider a real <button> (or keydown handler for Enter/Space) and tabindex={0}.
• The up button is enabled whenever current() is non-empty, but current() derives from the raw filter text — typing a plain search term (not a path) yields a nonsense parent target. The empty-target guard makes it a harmless no-op, but disabling unless the filter looks path-like might be cleaner.
• navigate() communicates the target directory by setting the filter to a trailing-slash path — it relies on an implicit convention of createDirectorySearch; a brief comment would help future readers.

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