feat(theme): add simple-large preset, xl scale and clean up channel badge dots

Implement the Simple Large-font theme preset and xl font scale options to enhance interface accessibility. Remove status indicator dots from channel badges in logs to keep the table layout visual and clean.

web/default/src/features/usage-logs/components/columns/column-helpers.tsx

@@ -183,6 +183,7 @@ export function createChannelColumn<T>(config: {
           autoColor={String(channelId)}
           copyText={String(channelId)}
           size='sm'
+          showDot={false}
           className='font-mono'
         />
       )

web/default/src/features/usage-logs/components/columns/common-logs-columns.tsx

@@ -332,6 +332,7 @@ export function useCommonLogsColumns(isAdmin: boolean): ColumnDef<UsageLog>[] {
                       autoColor={String(log.channel)}
                       copyText={String(log.channel)}
                       size='sm'
+                      showDot={false}
                       className='font-mono'
                     />
                     {affinity && (
@@ -554,7 +555,7 @@ export function useCommonLogsColumns(isAdmin: boolean): ColumnDef<UsageLog>[] {
             ? log.completion_tokens / useTime
             : null
         const timeVariant = getResponseTimeColor(useTime, log.completion_tokens)
-        const frtVariant = frt ? getFirstResponseTimeColor(frt / 1000) : null
+        const frtVariant = frt ? getFirstResponseTimeColor(frt / 1000) : 'neutral'
 
         const timingBgMap: Record<string, string> = {
           success: