Refactor: Clean up ChatRouterScreen and ChannelSideDrawer

- Removed `asSerialisedString()` function and `defaultForDMList` from `ChatRouterScreen.kt` as they were unused.
- Simplified `navigateToServer` in `ChatRouterScreen.kt` by removing logic to fetch and validate the last channel.
- Removed unused imports and `serverInfoOffset` from `ChannelSideDrawer.kt`.

app/src/main/java/chat/revolt/composables/screens/chat/drawer/ChannelSideDrawer.kt

@@ -1,9 +1,7 @@
 package chat.revolt.composables.screens.chat.drawer
 
-import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.Spring
-import androidx.compose.animation.core.VisibilityThreshold
 import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.spring
@@ -30,7 +28,6 @@ import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.requiredSize
 import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.statusBars
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.LazyListState
@@ -69,7 +66,6 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
-import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import chat.revolt.R
@@ -95,9 +91,7 @@ import chat.revolt.composables.generic.presenceFromStatus
 import chat.revolt.composables.screens.chat.ChannelIcon
 import chat.revolt.composables.screens.chat.discover.DiscoverServersList
 import chat.revolt.screens.chat.ChatRouterDestination
-import chat.revolt.screens.chat.LocalIsConnected
 import chat.revolt.sheets.ChannelContextSheet
-import com.google.android.material.color.MaterialColors
 
 @OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
 @Composable
@@ -153,17 +147,6 @@ fun ChannelSideDrawer(
         ), label = "Server banner height"
     )
 
-    val serverInfoOffset by animateDpAsState(
-        if (LocalIsConnected.current)
-            WindowInsets.statusBars.asPaddingValues().calculateTopPadding()
-        else
-            0.dp,
-        animationSpec = spring(
-            stiffness = Spring.StiffnessMediumLow,
-            visibilityThreshold = Dp.VisibilityThreshold
-        )
-    )
-
     // - Take the list of servers and filter them by the ones that are in the ordering.
     // - Sort the servers that are in the ordering using the ordering.
     // - Add the servers that aren't in the ordering to the end of the list.

app/src/main/java/chat/revolt/screens/chat/ChatRouterScreen.kt

@@ -114,21 +114,8 @@ sealed class ChatRouterDestination {
     data class ServersChannels(val serverID: String) : ChatRouterDestination()
     data class NoCurrentChannel(val serverId: String?) : ChatRouterDestination()
 
-    fun asSerialisedString(): String? {
-        return when (this) {
-            is Settings -> "overview"
-            is Friends -> "friends"
-            is Discover -> "discover"
-            is Channel -> null
-            is ServersChannels -> "channel/$serverID/servers"
-            is NoCurrentChannel -> "no_current_channel/$serverId"
-            ChatRouterDestination.Home -> "home"
-        }
-    }
-
     companion object {
         val default = Settings
-        val defaultForDMList = Settings
 
         fun fromString(destination: String): ChatRouterDestination {
             return when {
@@ -245,13 +232,7 @@ class ChatRouterViewModel @Inject constructor(
 
     fun navigateToServer(serverId: String) {
         viewModelScope.launch {
-            val savedLastChannel = kvStorage.get("lastChannel/$serverId")
-            val channelId =
-                savedLastChannel ?: RevoltAPI.serverCache[serverId]?.channels?.firstOrNull()
-            val channelExists = RevoltAPI.channelCache.containsKey(channelId)
-
             setSaveDestination(ChatRouterDestination.ServersChannels(serverId))
-//
         }
     }
 }