fix: merge close same-net parallel trace segments

[liufang88789-ui]

Summary\n- add a final TraceCleanup pass that merges close, overlapping, parallel internal segments when they belong to the same net\n- keep the change low-risk by skipping terminal segments and requiring both 1D overlap and a small merge-distance threshold\n- add focused tests covering horizontal/vertical merge and the key non-merge cases\n\n## Why\nAfter , same-net traces can end up visually split onto nearby Y/X coordinates. This patch snaps those close internal segments back together without touching different nets or distant/non-overlapping segments.\n\n## Validation\n- \n- bun test v1.3.11 (af24e281)

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All sub-solvers finished.\n\n## Claim\n/claim #34

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	Apr 15, 2026 1:17am

[liufang88789-ui]

Quick maintainer note: this PR is intentionally kept low-risk and focused.

• merges only close, overlapping, parallel internal same-net segments
• skips terminal segments to avoid changing endpoint behavior
• includes focused tests for both merge and non-merge cases
• all checks are green

If you'd prefer an even narrower version, I can trim it further.