fix(dcp): correct storage path to match OpenCode's actual location

DCP was failing to find session messages because it was looking in
~/.config/opencode/sessions instead of ~/.local/share/opencode/storage.
Unified all hooks to use getOpenCodeStorageDir() for cross-platform consistency.

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/hooks/session-recovery/constants.ts

@@ -1,7 +1,7 @@
 import { join } from "node:path"
-import { xdgData } from "xdg-basedir"
+import { getOpenCodeStorageDir } from "../../shared/data-path"
 
-export const OPENCODE_STORAGE = join(xdgData ?? "", "opencode", "storage")
+export const OPENCODE_STORAGE = getOpenCodeStorageDir()
 export const MESSAGE_STORAGE = join(OPENCODE_STORAGE, "message")
 export const PART_STORAGE = join(OPENCODE_STORAGE, "part")