optimize: terminal spawn lifecycle to eliminate output race condition

Move PTY spawn from context layer to view layer so event subscription
happens before spawn, preventing loss of initial terminal output.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/tauri.ts

@@ -1098,11 +1098,13 @@ export async function gitCommitBranches(
 
 export async function terminalSpawn(
   workingDir: string,
-  initialCommand?: string
+  initialCommand?: string,
+  terminalId?: string
 ): Promise<string> {
   return invoke("terminal_spawn", {
     workingDir,
     initialCommand: initialCommand ?? null,
+    terminalId: terminalId ?? null,
   })
 }