refactor(lab): persist legend filter through chart instances in scatter chart

[graphieros]

This improves the scatter chart by persisting the legend filtering through all chart instances, so the user does not have to filter again when switching classifications.
Also used a custom legend to fit the style of the app.

Summary by CodeRabbit

• New Features
  • Added a custom legend to the scatter chart, allowing you to toggle classification series on and off.
  • The chart now preserves your selected series when it loads.

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[github-actions]

Reads like a person wrote it · agent-style score 12/100

[coderabbitai]

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📝 Walkthrough

Walkthrough

The scatter chart now renders only the selected classification. Custom legend buttons toggle the human and ai series, and the component reapplies a recorded selection after mount. The tooltip retains its PR, repository, classification, score, verdict-strength, and verdict details.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to 64b55

Some classification switches can leave the chart appearing empty despite available data. This is a bounded visual issue that can be addressed before merge or accepted for follow-up.

Architecture Summary

Architecture risk: 🔵 Low · up to 64b55

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/PrTextVerdictScatter.vue: The script imports nextTick, useTemplateRef, and the scatter legend-selection event type for the new chart-selection handling.
• observed — Modified behavior in app/components/Chart/PrTextVerdictScatter.vue: Adds a computed selected chart and a chart template ref. Legend selection records the sole visible series, or clears the selection when zero or multiple series are selected; after mount, the recorded series is shown and the other human/ai series is hidden.
• observed — Modified behavior in app/components/Chart/PrTextVerdictScatter.vue: Replaces the loop over all classification charts and conditional chart wrapper with a single chart for the selected classification, keyed by classification and wired to the chart ref and legend-selection handlers. Axis labels now read score bounds from the selected chart.
• observed — Modified behavior in app/components/Chart/PrTextVerdictScatter.vue: Retains the tooltip’s PR, repository, classification, score, verdict-strength, and verdict details, while displaying them through the selected chart’s datapoint.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the scatter chart legend-filter change, which matches the pull request’s objective to preserve the filter when users switch classifications.

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @app/components/Chart/PrTextVerdictScatter.vue:
- Around line 286-287: Update applySelectedLegend to check whether the selected
series in the current chart has values before restoring its saved filter; if it
has none, leave the filter unchanged so another populated series remains
visible.

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ℹ️ Review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 83e6018 and 64b5587.

📒 Files selected for processing (1)

• app/components/Chart/PrTextVerdictScatter.vue

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