Section + Theme: lighten LIGHT canvas to 0.97; revert custom hover overlay

User feedback: the off-white canvas at 0.95 (#F2F2F2) read as too
dark. Two coordinated changes:

- canvasColorForCurrentTheme LIGHT branch: 0.95f → 0.97f. Canvas now
  #F7F7F7 (3% darker than white, was 5%). Still distinct from pure
  white card but lighter.

- Drop the custom sectionItemHover Modifier helper (and its hoverable
  + InteractionSource + background machinery). The reason for the
  custom hover was that the default Material 0.04-alpha ripple hover
  (#F5F5F5 on white card) blended with the old #F2F2F2 canvas. With
  the lighter canvas at #F7F7F7 the default hover #F5F5F5 is now
  visibly darker than canvas (2 units delta) — visible enough at
  Material default without our custom override.

Removed unused MutableInteractionSource and collectIsHoveredAsState
imports.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/ui/theme/Theme.kt

@@ -607,7 +607,7 @@ fun canvasColorForCurrentTheme(): Color {
   val theme = CurrentColors.value
   val c = theme.colors
   return when (theme.base) {
-    DefaultTheme.LIGHT -> c.background.mixWith(c.onBackground, 0.95f)
+    DefaultTheme.LIGHT -> c.background.mixWith(c.onBackground, 0.97f)
     DefaultTheme.SIMPLEX -> c.background.darker(0.4f)
     else -> c.background
   }

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/helpers/Section.kt

@@ -1,6 +1,4 @@
 import androidx.compose.foundation.*
-import androidx.compose.foundation.interaction.MutableInteractionSource
-import androidx.compose.foundation.interaction.collectIsHoveredAsState
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.*
@@ -35,23 +33,6 @@ val CARD_ITEM_PADDING = CARD_PADDING - 1.dp
 // standalone usage (alerts, pickers, custom contexts) unaffected.
 private val LocalInSectionCard = staticCompositionLocalOf { false }
 
-// Modern hover overlay for section card items (replaces deprecated RippleTheme
-// override). Adds its own hover-state background so the hovered row is visible
-// against the off-white LIGHT canvas (where the default 0.04-alpha ripple hover
-// blends in). Click ripple is still provided by Modifier.clickable's own
-// indication — this only handles the persistent hover overlay.
-// `enabled = false` suppresses hover for disabled items.
-// `clickable = false` suppresses hover for rows whose action is an inline
-// control (switch, dropdown) rather than navigating the whole row — those
-// rows aren't "interactive as a whole", so hover feedback is misleading.
-@Composable
-private fun Modifier.sectionItemHover(enabled: Boolean = true, clickable: Boolean = true): Modifier {
-  if (!enabled || !clickable || !LocalInSectionCard.current) return this
-  val interactionSource = remember { MutableInteractionSource() }
-  val isHovered by interactionSource.collectIsHoveredAsState()
-  val hoverColor = if (isHovered) MaterialTheme.colors.onBackground.copy(alpha = 0.05f) else Color.Transparent
-  return this.hoverable(interactionSource).background(hoverColor)
-}
 
 @Composable
 private fun Modifier.sectionItemDivider(): Modifier {
@@ -204,7 +185,6 @@ fun SectionItemView(
   val modifier = Modifier
     .fillMaxWidth()
     .sizeIn(minHeight = minHeight)
-    .sectionItemHover(enabled = !disabled, clickable = click != null)
     .sectionItemDivider()
   Row(
     if (click == null || disabled) modifier.padding(padding) else modifier.clickable(onClick = click).padding(padding),
@@ -245,7 +225,6 @@ fun SectionItemViewLongClickable(
   val modifier = Modifier
     .fillMaxWidth()
     .sizeIn(minHeight = minHeight)
-    .sectionItemHover(enabled = !disabled)
     .sectionItemDivider()
   Row(
     if (disabled) {
@@ -271,7 +250,6 @@ fun SectionItemViewSpaceBetween(
   val modifier = Modifier
     .fillMaxWidth()
     .sizeIn(minHeight = minHeight)
-    .sectionItemHover(enabled = !disabled, clickable = click != null)
     .sectionItemDivider()
   Row(
     if (click == null || disabled) modifier.padding(padding).padding(vertical = DEFAULT_MIN_SECTION_ITEM_PADDING_VERTICAL) else modifier