Add logs tab with real-time server output and consolidate syntax highlighting

- Implement dedicated Logs tab showing stdout/stderr from OpenCode server
- Add log level parsing (INFO, ERROR, WARN, DEBUG) with color coding
- Stream logs from main process to renderer via IPC events
- Persist scroll position and auto-scroll state per instance
- Synchronize instance IDs between renderer and main process
- Consolidate syntax highlighting to single shared highlighter instance
- Optimize markdown rendering with global highlighter initialization
- Fix code block copy button to always appear on right side
- Enable debug logging with --print-logs --log-level DEBUG flags

src/types/instance.ts

@@ -1,5 +1,11 @@
 import type { OpencodeClient } from "@opencode-ai/sdk/client"
 
+export interface LogEntry {
+  timestamp: number
+  level: "info" | "error" | "warn" | "debug"
+  message: string
+}
+
 export interface Instance {
   id: string
   folder: string
@@ -8,10 +14,5 @@ export interface Instance {
   status: "starting" | "ready" | "error" | "stopped"
   error?: string
   client: OpencodeClient | null
-}
-
-export interface LogEntry {
-  timestamp: number
-  level: "info" | "error"
-  message: string
+  logs: LogEntry[]
 }