fix(tui): sort directory completions first for quoted values

[yuzhiyang1]

The path-completion sort in packages/tui/src/autocomplete.ts decided "is a directory" via suggestion.value.endsWith("/"). When the completion value is quoted (paths with spaces, or @"..." prefixes), buildCompletionValue returns e.g. @"dir/" — which ends with ", not / — so aIsDir was always false and the directory-first ordering silently did nothing for quoted completions.

Sort on label instead (which is name + "/" for directories), matching how the rest of the file treats labels.

Note

Fix directory completion sorting for quoted values and edit-diff occurrence counting

• Fix autocomplete directory-first sorting by checking the suggestion label's trailing slash instead of the value's, since quoted values may not end with a slash. See autocomplete.ts.
• Fix countOccurrences in edit-diff.ts to count literal occurrences and return 0 for empty oldText, instead of counting splits.
• Fix applyEditsToNormalizedContent to count occurrences in the same normalization space as the successful match: exact matches stay unique even if fuzzy normalization would create extra occurrences; fuzzy matches enforce uniqueness in the normalized space.
• Risk: countOccurrences no longer uses fuzzy normalization when counting; callers relying on normalized counting behavior will get literal counts instead.

^{Macroscope summarized 60e4a1e.}

[github-actions]

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