fix(lab): avoid time label overlap with data label on hover

[graphieros]

This fixes the overlap between the data label and the time label when hovering the charts, and also adds a discrete dashed line to signal the zero axis.

Let's see how the detector behaves with a before after table^^:

Before	After

Summary by CodeRabbit

• Bug Fixes
  • Improved chart readability by adding a dashed zero baseline, adjusting chart spacing, and repositioning time labels.

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[github-actions]

Reads like a person wrote it · agent-style score 9/100

Signals

Signal	Hits	Contribution
lays information out in markdown tables	3	+0.14
uses contractions (don't, it's, we'll)	1.91	-0.46

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📝 Walkthrough

Walkthrough

The chart padding and y-axis scale settings change. Time labels move lower. The chart calculates the zero-baseline position from the data range and drawing area, then renders a dashed horizontal line at that position.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Merge Risk: 🔵 Low · up to 147d6

If every activity value is zero, the new dashed zero line may not render. The rest of the chart is unaffected, and the fix is a one-line guard. This is safe to merge after a small follow-up.

Architecture Summary

Architecture risk: 🔵 Low · up to 147d6

The change affects 1 system.

Changed systems: app

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — app (ui) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in app/components/Chart/LinesDiff.vue: Adds the VueUiXySvgSlotProps type import for the SVG slot props used to calculate the chart’s zero-baseline position.
• observed — Modified behavior in app/components/Chart/LinesDiff.vue: Chart padding changes from top: -12 to top: 12 and sets bottom: 24.
• observed — Modified behavior in app/components/Chart/LinesDiff.vue: Disables the y-axis nice-scale behavior; the configured scaleMin and scaleMax remain in place.
• observed — Modified behavior in app/components/Chart/LinesDiff.vue: Adds getZeroY, which positions zero within the drawing area using the chart’s maximum and the absolute value of its minimum.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the time-label repositioning that prevents overlap with data labels on hover. The dashed zero-axis line is a secondary change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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app/components/Chart/LinesDiff.vue

ESLint skipped: missing config or dependency (missing-dependency). The ESLint configuration references a package that is not available in the sandbox.

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Actionable comments posted: 1

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Inline comments:
Review comments at @app/components/Chart/LinesDiff.vue:
- Line 184: Update getZeroY in LinesDiff.vue to use the drawing-area midpoint
when max is not positive or is non-finite, avoiding division by zero; keep the
existing baseline calculation for valid positive denominators.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Repository: MatteoGabriele/agentscan/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 0083ed47-3149-4939-9d68-ccd5c0d517dd

📥 Commits

Reviewing files that changed from the base of the PR and between 83e6018 and 147d6f8.

📒 Files selected for processing (1)

• app/components/Chart/LinesDiff.vue

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[MatteoGabriele]

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