Closes #61410

## Summary

Tree-sitter bracket queries can become incomplete when recovering from
syntax errors. The existing code handled incorrect matches by collecting
the delimiters returned by the query and pairing them again in order.

The query missed the innermost closing parenthesis. The repair therefore
worked on an incomplete sequence, paired the innermost opening
parenthesis with the next available close, and shifted every remaining
pair outward.

## Solution

This change records the syntax-node kinds used by each bracket pattern
and, when a syntax layer contains errors, checks the concrete leaves
inside those error nodes for delimiters missing from the query output.

When the opening and closing kinds are different and the error range
remains balanced, the missing delimiters are included in the existing
reconstruction.

## Testing

Reproduced the issue using the C snippet from #22679 and verified that
each parenthesis is matched with its correctly nested partner.
Also verified that unbalanced code does not cause the recovery logic to
invent a missing bracket pair.

## How to Review

The relevant changes are in `BufferSnapshot::fetch_bracket_ranges` in
`crates/language/src/buffer.rs`.

The important distinction is between the bracket-query output and the
concrete syntax leaves inside an error node. Previously, the repair
could only rearrange delimiters present in the query output. It can now
detect when that output is incomplete, add the missing real delimiters,
and run the existing reconstruction over the complete set.

## Self-Review Checklist

* [x] I've reviewed my own diff for quality, security, and reliability
* [x] Unsafe blocks, if any, have justifying comments
* [x] The content is consistent with the [[UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
* [x] Tests cover the new/changed behavior
* [x] Performance impact has been considered and is acceptable

Release Notes:

* Fixed incorrect bracket matching when syntax-error recovery omitted a
delimiter.

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Co-authored-by: Kirill Bulatov <kirill@zed.dev>