feat(v1.46): touch-feel baseline + 44px tap targets

[MP2EZ]

First slice (Themes B + C) of the post-TestFlight mobile-polish pass for the Capacitor iOS shell. Audit-driven; scoped so desktop web is byte-identical — changes are either inert on pointer devices or gated behind `@media (hover: none)`.

Theme B — touch feel (global, no-op on desktop)

• `touch-action: manipulation` → removes the 300ms double-tap-zoom delay
• `-webkit-tap-highlight-color: transparent` → kills the gray iOS tap flash
• `-webkit-touch-callout: none` + `user-select: none` on UI chrome → no long-press callout / accidental text selection on buttons
• `:active` opacity feedback → touch has no `:hover`, so taps had zero visual confirmation before this

Theme C — tap-target sizing (`@media (hover: none)`, ≥44px per Apple HIG / WCAG 2.5.8)

• Date-picker days, save-to-trip / share / watch-action / watch-cta / header / tag buttons, book/map card links → min 44px
• watch-close, compare-close → 44px square
• compare-check keeps its 24px visual; a transparent `::after` overlay extends the hit area to 44px
• Dense calendar-heatmap cells intentionally excluded (per CLAUDE.md) — their hit area is handled by cell spacing, not by inflating every cell

Verification

• `npm run build` clean
• 213/213 frontend tests pass
• Pure CSS; +83 lines, one file (`web/src/App.css`)

Not in this PR (next slices)

• A — safe-area completeness incl. the known status-bar scroll-bleed follow-up + modal safe-area/scroll-lock
• D — responsive layout gaps (search-form/poll grids, MapView mobile, modal widths)
• E — keyboard handling (needs `@capacitor/keyboard`)

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