fix(theme): let the shard's panel color and pill radius reach Material's defaults (M12 phase 8)

Two defects found on device by phase 8's AC-5 walk, both the same trap phase 2
hit with card elevation: Material takes these values as DEFAULT ARGUMENTS, not
from the theme, so mapping the token is not enough on its own.

1. Every ShardCard drew in Material's grey, not the shard's panel color.
   CardDefaults.cardColors() takes its container from surfaceContainerHighest -
   FilledCardTokens.ContainerColor, checked in the material3 1.3.0 artifact's
   bytecode - and shardColorScheme mapped surfaceContainer, High and Low but not
   Highest. All 26 ShardCard sites across 20 files were affected. Themed
   instances showed it worst: on Fantasy the page went brown and the cards
   stayed grey.

   This is NOT an M12 regression. The untouched app draws the same grey cards
   and has since M5; M12 only made it obvious by theming everything around them.
   Fixing it therefore changes the untouched app too - cards move from Material's
   grey to --panel-flat - which is the milestone's second deliberate change to a
   shard that has set nothing, alongside phase 2's card shadow. AC-1 is updated
   to record that rather than absorb it: every other role is still asserted
   byte-for-byte against the verbatim pre-M12 scheme, and the two that moved are
   named, given their new values, and checked to have actually differed before.

   surfaceContainerLowest is mapped alongside it for consistency with
   surfaceContainerLow. It has no reader in this app - the phase 8 sweep checked
   every Material component the app draws against the roles the mapping leaves at
   Material defaults, and surfaceContainerHighest was the only live one. The
   drawer scrim reads the unmapped `scrim`, which stays Material's black
   deliberately.

2. The drawer's selected row ignored --radius-pill. NavigationDrawerItem takes
   `shape` as a default argument (CircleShape); the three call sites set `colors`
   but never `shape`, so on Fantasy every other radius went square while the
   selected row stayed fully round.

Verified on device against a Fantasy-themed local instance: the three ShardCards
on the shard screen now paint --panel-flat, and the selected drawer row is the
4px rectangle the preset asks for.

477 unit tests green (476 + 1), lintDebug clean.

Co-Authored-By: Claude <noreply@anthropic.com>

app/src/main/java/com/runicgateway/app/ui/RunicApp.kt

@@ -94,6 +94,7 @@ import com.runicgateway.app.ui.shard.MarketVendorScreen
 import com.runicgateway.app.ui.shard.RulesScreen
 import com.runicgateway.app.ui.shard.ShardBoard
 import com.runicgateway.app.ui.shard.ShardScreen
+import com.runicgateway.app.ui.theme.LocalShardStructure
 import com.runicgateway.app.ui.wiki.WikiPageScreen
 import com.runicgateway.app.ui.wiki.WikiScreen
 import kotlinx.coroutines.launch
@@ -263,6 +264,7 @@ fun RunicApp(
                         }
                     },
                     colors = drawerItemColors,
+                    shape = LocalShardStructure.current.pill,
                     modifier = Modifier.padding(NavigationDrawerItemDefaults.ItemPadding),
                 )
                 NavigationDrawerItem(
@@ -273,6 +275,7 @@ fun RunicApp(
                         onChangeServer()
                     },
                     colors = drawerItemColors,
+                    shape = LocalShardStructure.current.pill,
                     modifier = Modifier.padding(NavigationDrawerItemDefaults.ItemPadding),
                 )
                 }
@@ -383,6 +386,11 @@ private fun NavRow(
             }
         },
         colors = colors,
+        // Like Card's elevation, NavigationDrawerItem takes its shape as a default
+        // argument (CircleShape) rather than from the theme, so --radius-pill has to
+        // be handed to it at every call site or the selected row stays fully round
+        // while every other radius follows the shard (phase 8's AC-5 walk).
+        shape = LocalShardStructure.current.pill,
         modifier = Modifier
             .padding(NavigationDrawerItemDefaults.ItemPadding)
             .padding(start = if (indented) 16.dp else 0.dp),

app/src/main/java/com/runicgateway/app/ui/theme/Theme.kt

@@ -36,7 +36,14 @@ internal fun shardColorScheme(palette: ShardPalette): ColorScheme = darkColorSch
     onSurfaceVariant = palette.muted,
     surfaceContainer = palette.elevated,
     surfaceContainerHigh = palette.elevated,
+    // Material's filled Card takes its container from surfaceContainerHighest —
+    // FilledCardTokens.ContainerColor, checked in the 1.3.0 artifact's bytecode.
+    // Leaving it unmapped is what made every ShardCard draw in darkColorScheme()'s
+    // default grey instead of --panel-flat, on themed AND untouched instances alike
+    // (found on device in phase 8's AC-5 walk; see "Phase 8 as landed").
+    surfaceContainerHighest = palette.elevated,
     surfaceContainerLow = palette.surface,
+    surfaceContainerLowest = palette.surface,
     outline = palette.outline,
     outlineVariant = palette.divider,
     secondaryContainer = palette.pillBg,   // neutral chips / selected drawer item