codex

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Charlie Marsh d847857f80 Use popup token ranges for autocomplete insertion (#31190 )

## Summary

Autocomplete popup synchronization already identifies the active token's
range and query, but accepting a result previously discarded that range
and independently recomputed token boundaries around the cursor. Those
calculations could disagree at ambiguous cursor positions. For example,
in `@first| @second` (with `|` marking the cursor at the intervening
space), the popup targets `@second`, while the old acceptance path
replaces `@first`.

This threads the active range through legacy file search, skill
mentions, and mentions-v2 completion. File, image, and mention insertion
now replace the same token that supplied the popup query, and image
completion reuses the shared file insertion path.

## Stack

This is PR 1 of 3. #31191 builds separator and dismissal behavior on
these explicit replacement ranges, and #30463 then fixes token affinity
between adjacent mentions.

2026-07-06 17:48:06 -04:00