Pop-out window renders wrong/duplicate charts for Spec Scatter & EPA Curves

[pluginpath-ops]

Bug — pop-out chart routing

src/components/PopoutView.jsx routes charts by chartMode but uses a catch-all branch that renders <ChargingView> for any mode it doesn't explicitly handle:

selectedVehicles.length > 0 && chartMode !== 'compare' && chartMode !== 'specs' && chartMode !== 'roadtrip'

Consequences:

• Spec Scatter (chartMode === 'specscatter') falls through to the catch-all, so the pop-out shows the Charging chart instead of the scatter. PopoutView doesn't import SpecsScatterView at all.
• EPA Curves (chartMode === 'epacurves') matches both the catch-all (→ ChargingView) and its own epacurves branch (→ EpaCurvesView), so two charts render at once.
• Range survives only by luck — ChargingView internally delegates to RangeChartView when chartMode === 'range'.

Steps to reproduce

1. Select vehicles, open the Charts tab.
2. Go to Spec Scatter (or EPA Curves) and click ⧉ Open Chart in New Window.
3. Spec Scatter: the pop-out shows the Charging line chart. EPA Curves: two charts render.

Expected

Each sub-tab's pop-out renders its own chart, once.

Suggested fix

Replace the catch-all in PopoutView with explicit per-mode handling:

• Import + render SpecsScatterView for specscatter (mirror src/App.jsx, pass presentationMode).
• Scope the ChargingView branch to the modes it actually handles (charging/range) so epacurves and specscatter don't fall into it.

SpecsScatterView already accepts a presentationMode prop (added in #127) that hides the help bubble in the pop-out.

Related housekeeping (lower priority, mostly cosmetic)

Inconsistencies across the 7 Charts sub-tabs, noted while adding the help bubbles (#127). Optional — listed for context, not all worth doing:

• Zoom parity — only Charging and Road Trip have drag-to-zoom + Reset Zoom; Range & Efficiency, Charge Compare, EPA Curves, Spec Chart, Spec Scatter have none.
• Button sets — Copy URL / Copy PNG present on most but not uniform; Reset Zoom only on Charging.
• Structure — Specs views use .specs-chart-card (vs .card), no AxisScaleControls / Auto-Color toggle.

bar / line / scatter render differences are inherent and intentionally left as-is.

Context: follow-up to #127 (chart help bubbles).