fix(ui): spacing polish and one look for every form field

[joszz]

Summary

Three commits, best reviewed one at a time.

1. Spacing and card titles (4ae4224)

• Every card heading uses .card-title. The statistics charts and the trip sidebar gain an icon, and three look-alike title classes are gone.
• Statistics chart cards use the standard 1.25rem card padding and 1.5rem section spacing. The trip log totals are spaced like the status grid.
• Page subtitles share .view-subtitle, which sits close under the page title.
• The maintenance detail modal uses the shared modal sections.
• Phones use one 0.75rem gutter for content, topbar and footer. The breakpoint under 400px that shrank it is removed.
• Form controls inherit the page font through one global rule. Small buttons get side padding. Control corners are 6px everywhere.

2. Native vehicle type select, one size for every field (ce8d793)

• Vehicle type in Settings now uses a native select (SettingsSelect), like the region and units choices. The detected type gets its own settings row. The multiselect is now only used for the map's fuel type and brand filters.
• Shared --field-* tokens set the padding, font size, line height, corner radius and focus ring for native selects, text fields and the multiselect.
• Native selects use the multiselect's caret (one colour per theme) and its focus ring. form-select-sm is removed. That smaller variant was why the selects in Settings and the map's Period filter had less padding.
• Time-of-day selects in the climate schedule form use form-select instead of form-control.
• Multiselect height: the library's inner wrapper counted the border twice, which made every multiselect 2px taller than other fields. A small override fixes it.

3. Charging power filter header (1bcea38)

The label and description ran together on one line ("Power (kW)Filter stations by..."), and the slider's tooltips covered both. They now stack like the fuel filters, with room above the slider for the tooltips.

Test plan

• vitest run: 80 files, 850 tests pass
• vue-tsc --build, stylelint, oxlint, eslint and Prettier are clean
• Checked in the demo app (Playwright) at 1440px and 390px, in dark and light themes. Settings, map filters, climate schedule form and trip log filters all measure 33.25px per field, and nothing overflows.

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