feat: introduce useEffectiveDirectory hook and adopt across views (#226)

Add a centralized useEffectiveDirectory hook to resolve the active directory
Use the hook across DiffView, FilesView, GitView, and TerminalView
Fix list styling by rendering ul/ol bullets outside

packages/ui/src/hooks/useEffectiveDirectory.ts

@@ -0,0 +1,48 @@
+import { useSessionStore } from '@/stores/useSessionStore';
+import { useDirectoryStore } from '@/stores/useDirectoryStore';
+import type { Session } from '@opencode-ai/sdk/v2';
+
+/**
+ * Hook that resolves the effective working directory for tabs (Git, Diff, Files, Terminal).
+ * 
+ * Priority order:
+ * 1. Worktree metadata path (for worktree sessions)
+ * 2. Session directory (for active sessions)
+ * 3. Draft session directoryOverride (when creating a new session)
+ * 4. Fallback directory from DirectoryStore
+ * 
+ * This ensures that tabs show content from the correct project directory
+ * even when a draft session is being created.
+ */
+export const useEffectiveDirectory = (): string | undefined => {
+    const {
+        currentSessionId,
+        sessions,
+        worktreeMetadata: worktreeMap,
+        newSessionDraft,
+    } = useSessionStore();
+    const { currentDirectory: fallbackDirectory } = useDirectoryStore();
+
+    // If we have an active session, use its directory
+    if (currentSessionId) {
+        const worktreeMetadata = worktreeMap.get(currentSessionId);
+        if (worktreeMetadata?.path) {
+            return worktreeMetadata.path;
+        }
+
+        const currentSession = sessions.find((session) => session.id === currentSessionId);
+        type SessionWithDirectory = Session & { directory?: string };
+        const sessionDirectory = (currentSession as SessionWithDirectory | undefined)?.directory;
+        if (sessionDirectory) {
+            return sessionDirectory;
+        }
+    }
+
+    // If a draft session is open, use its directoryOverride
+    if (newSessionDraft?.open && newSessionDraft.directoryOverride) {
+        return newSessionDraft.directoryOverride;
+    }
+
+    // Fall back to the global directory
+    return fallbackDirectory ?? undefined;
+};