Removed unused depth map from comment thread graph

[irontaek]

Why

buildThreadGraph in apps/comments-ui/src/utils/thread-graph.ts fills a depthById map for every reply and never reads it:

const depthById = new Map<string, number>();
// …
depthById.set(reply.id, depth);

Those are the only two occurrences of depthById in the repository. The same value is written onto the reply itself one line earlier (reply.depth = depth), and every later depth lookup in the file (getAncestorAtDepth, getWindowForComment) reads reply.depth / current.depth.

What

Removes the map and the set call. Nothing else changes.

Tests

No test change. The removed map had no consumer, so behaviour is identical.

• I've read and followed the Contributor Guide

https://claude.ai/code/session_01W9Mk18mBNfkPfgg3hYweKq

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📥 Commits

Reviewing files that changed from the base of the PR and between 157ad0f and f5d625f.

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📒 Files selected for processing (1)

• apps/comments-ui/src/utils/thread-graph.ts

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💤 Files with no reviewable changes (1)

• apps/comments-ui/src/utils/thread-graph.ts

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Walkthrough

buildThreadGraph no longer creates a local depthById map or writes reply depths to it. It continues to assign depth values directly to each reply.

Priority: ⬇️ Low

Change: Refactor

Merge Risk: ⚪ Minimal · up to f5d62

No behavior change or merge-blocking concern is identified; this cleanup is mergeable after normal checks.

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: removing the unused depth map from the comment thread graph.
Description check		The description directly explains why the unused depthById map and its set call were removed, and it matches the reported changes.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Type-Safe Boundaries		The PR only removes the local depthById declaration and its set call from buildThreadGraph. The diff adds no boundary-data consumption, any, unchecked as, @ts-nocheck, or @ts-ignore. Dep…
New Files Are Typescript		The pull request modifies one pre-existing TypeScript file. It adds no files and adds no .js, .jsx, .cjs, or .mjs source file.

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