random ui/ux fixes

[tika]

• fix: consistent header spacing on pages
• feat: responsive chart page
• feat: add responsive actions to map page too
• fix: export issue when switching tabs
• fix: make whole column clickable
• fix: click event being swallowed on schools page sort
• feat: responsive map page
• fix: if no map date, do not display any year

closes #155, #90

Favour filter popover over single toggle

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Project	Deployment	Actions	Updated (UTC)
mhd	Ready	Preview, Comment	Apr 13, 2026 4:04pm

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PR Summary

Medium Risk
Mostly UI/UX refactors, but it changes map layer rendering/visibility and export behavior (chart ref handling), which could impact user-visible functionality across key pages.

Overview
Improves responsiveness on the chart and map pages by moving filters and share/actions into mobile-friendly Sheet/Popover UIs, while keeping full sidebars/actions on larger breakpoints.

Fixes chart export reliability when switching between bar/line by wrapping the animated chart area in a stable container ref, and updates cart/empty-state iconography (ShoppingBasket).

Adds new heatmap toggles (showHeatmap, showRegions) persisted in the URL and wires them through useHeatmapLayers to control MapLibre layer visibility; also tweaks heatmap title formatting to omit the year when not selected.

Makes table sorting/resizing interactions less error-prone by making sortable column headers fully clickable and preventing resize handles from triggering sort clicks.

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