fix(theme): correct Safari date input colors in dark mode

[PhilemonChiro]

Summary

• Fix date input visual feedback in Safari dark mode
• Change --input oklch lightness from 1 to 0.95 in dark mode themes

Problem

In Safari dark mode, when a user deletes part of a date input (day, month, or year), the empty portion should appear muted to indicate it's not set. However, with oklch(1 0 0 / 15%), Safari doesn't render this feedback correctly.

This causes:

• No visual indication that date parts are missing
• Broken native browser form validation UX
• Users thinking a date is set when it's not

Root Cause

Safari has a quirk where oklch(1 0 0 / ...) (exactly 1.0 lightness = pure white) doesn't trigger the expected "empty" styling for date inputs. Using 0.95 (visually similar) fixes this and provides better muted feedback.

Solution

/* Before */
--input: oklch(1 0 0 / 15%);

/* After */  
--input: oklch(0.95 0 0 / 15%);

Files Changed

• apps/v4/styles/globals.css - base dark mode theme
• apps/v4/registry/themes.ts - all theme variants (neutral, stone, zinc, slate)

Test plan

• Tested on Safari macOS in dark mode
• Verified deleted date parts show muted/grayed styling
• Confirmed the muted effect is clearly visible

Fixes #9212

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