fix(seeds): default form controls to 16px on mobile (prevent iOS zoom)

[mattmaynes]

What

iOS Safari auto-zooms the page when a focused form control's font-size is under 16px. Input, Textarea, and the Select trigger all used text-sm (14px), so every canopy consumer hit this on phones (surfaced on rogueoak.com - rogueoak feedback 0002).

Fix

Set the three focusable field controls to text-base md:text-sm - 16px on mobile (no zoom), 14px from the md breakpoint up (preserves desktop density). SelectItem/SelectLabel dropdown rows stay text-sm (not focusable, never zoom). One test per control locks text-base md:text-sm. Captured in docs/feedback/0017.

Verification

• pnpm test (265 tests, +3 new), pnpm lint, pnpm build all green.

Fixes the bug at the design-system layer so consumers inherit it and drop their per-app overrides (rogueoak had a stopgap text-base on the subscribe inputs, to be removed once this ships).

🤖 Generated with Claude Code

https://claude.ai/code/session_01NYM2qa9QBSvQYBGP3pATQK

[mattmaynes]

🎨 Spectra Designer - approve

Typography and density check out. The three focusable field controls (Input, Textarea, Select trigger) now share one consistent text-base md:text-sm token pair, and the md: responsive pattern already exists across other seeds (Avatar, Button, Keyboard, Spinner), so the breakpoint choice is in-house-consistent, not a one-off.

Density on the tightest control holds: Input sm is h-8 (32px); text-base (16px) carries a 24px line-height, which sits inside 32px with ~4px slack top and bottom - no overflow, no crowding. Coverage is complete: Input, Textarea, and the Select trigger are the full set of text-entry/combobox controls, and all Input size variants inherit the shared base. Checkbox/Radio/Switch/Button are focusable but aren't text fields, so iOS zoom never applied - correctly left alone. SelectItem and SelectLabel stay text-sm (non-focusable dropdown rows keep their 14px density).

Nothing material open in the designer facet.

[mattmaynes]

Note: added a chore(format) commit running prettier --write on apps/storybook/src/Foundations.stories.tsx. That file had a pre-existing format:check failure on main (from #46) that fails CI repo-wide (prettier --check .) and would block this PR regardless. Formatting only, no logic change.