## Summary
- Add support for showing line number ranges (e.g., ":L3-L5") in the
Read file display
- Pass `start_line` and `end_line` attributes from the markdown parser
to the DyadRead component
- Display line number suffix in the file path to provide better context
when viewing partial file reads

## Test plan
- [x] Verify line numbers appear correctly when a file read includes
start/end lines
- [x] Verify files read without line numbers display normally
- [x] All tests pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Show line numbers in the Read file path for partial file reads. Start
and end lines are parsed from markdown and rendered as a :L suffix
(e.g., :L3-L5) for clearer context.

- **New Features**
- Parse start_line and end_line in DyadMarkdownParser and pass to
DyadRead.
- DyadRead builds and displays line suffix (:L3, :L3-L5, or :L1-L5) next
to the filename; tooltip shows full path with suffix.
  - Files without line numbers render unchanged.

<sup>Written for commit 301bd200f245d934974c8d09ab0edf6ae42d7e9c.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->
Co-authored-by: Will Chen <willchen90@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>