fix(web): remove excess sidebar thread spacing

[maria-rcks]

the sidebar gap below "all projects" grew to 21 css pixels after #9731 added top padding and invisible drag markers; #10464 added another marker. remove the extra padding and cancel the zero-height markers' flex gaps, restoring the original 10px spacing while keeping drag targets measurable.

verified the spacing in the real web client in dark and light themes, project filtering and reset, and pointer-event drags into pinned and back into the empty active section with persisted state checks. 203 existing sidebar logic/drag tests, web typecheck, and scoped lint pass (existing lint warnings only); this shared sidebar serves web and desktop, while mobile has a separate sidebar.

before, dark:

after, dark:

before, light:

after, light:

model: gpt-5.6-sol. harness: codex.

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[macroscopeapp]

Approvability

Verdict: Approved at 2f37a9a

Macroscope's review found this PR approvable — The change is limited to three Tailwind class adjustments in the existing sidebar, removing excess padding and correcting one-pixel spacing around drag markers. Its impact is confined to sidebar layout geometry without introducing new capability or broader production behavior.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0d34579 and 2f37a9a.

📒 Files selected for processing (1)

• apps/web/src/components/Sidebar.tsx

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📝 Walkthrough

Walkthrough

The sidebar thread list removes top padding. Sortable placeholder and drag-boundary markers add a 1px negative bottom margin.

Changes

Sidebar spacing alignment

Layer / File(s)	Summary
Update sidebar spacing classes apps/web/src/components/Sidebar.tsx	Sortable markers add -mb-px. The thread list removes pt-2.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 2f37a

The sidebar restores the intended spacing below All projects while retaining drag targets; no current merge-blocking risk remains.

Suggested reviewers: juliusmarminge, t3dotgg, utkarshusername

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: removing excess spacing in the web sidebar.
Description check	✅ Passed	The description explains the spacing problem, the implementation, scope, verification steps, test results, and includes before/after screenshots for the UI change. It does not use the template heading…

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