feat(Pressable): add support for PlatformColor and alpha

[adrcotfas]

Summary:

android_ripple on Pressable (and TouchableNativeFeedback.Ripple()) only
accepted numeric (pre-processed ARGB int) colors. Passing a PlatformColor
would throw an invariant in JS, making theme-aware ripple colors impossible.

This PR removes those guards and wires up the full color pipeline:

1. JS (useAndroidRippleForView.js, TouchableNativeFeedback.js):
   removed the invariant that rejected non-numeric processed colors.
   TouchableNativeFeedback.Ripple() now accepts ColorValue instead of
   string.
2. C++ (NativeDrawable.h, HostPlatformViewProps.cpp): color
   changed from int32_t to SharedColor + a separate colorResourcePaths
   field for PlatformColor resource paths. The fromRawValue pipeline now
   resolves both plain colors and PlatformColor objects.
3. Kotlin (ReactDrawableHelper.kt): getColor() now handles both
   numeric and PlatformColor map values via ColorPropConverter.getColor(),
   catching JSApplicationCausedNativeException to fall back gracefully
   instead of crashing.
4. Theme change support (ReactViewGroup.kt): the raw drawable
   description maps are retained on the view, and onConfigurationChanged
   re-applies them so ripple colors update automatically on light/dark mode
   switch.

A new alpha: number (0–1) field is also added so users can apply opacity to
a PlatformColor whose value is fully opaque and can't have alpha embedded at
the JS level. It is applied by multiplying into the resolved color's alpha
channel.

Unresolvable PlatformColor resources are handled gracefully: on New Arch,
C++ omits the color key so Kotlin falls back to colorControlHighlight; on
Old Arch, ReactDrawableHelper catches the JSApplicationCausedNativeException
and falls back to colorControlHighlight instead of crashing.

Changelog:

[ANDROID] [ADDED] - android_ripple now accepts PlatformColor for
theme-aware ripple colors, and a new alpha (0–1) parameter for controlling
ripple opacity independently of the color value.

Test Plan:

Automated:

• Existing Pressable snapshot tests pass unchanged.
• Updated snapshot for PlatformColor + alpha to use ?attr/colorAccent
  (matching the RNTester example).
• Added snapshot test should not crash with an unresolvable PlatformColor
  verifying the component renders at the JS level without throwing.

Manual (RNTester → Pressable → "Pressable with PlatformColor ripple and alpha"):

1. PlatformColor('?attr/colorAccent'), no alpha → full-opacity accent ripple
2. PlatformColor('?attr/colorAccent'), alpha=0.3 → 30% opacity accent ripple
3. #FF0000, no alpha → full red ripple (regression check)
4. #FF0000, alpha=0.5 → 50% opacity red ripple
5. Toggle system light/dark mode → ripple color updates automatically
6. Pass an intentionally invalid attribute (e.g. ?attr/doesNotExist) → no
   crash, ripple falls back to default colorControlHighlight grey

Screen_recording_20260410_091000.webm

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