✨ feat(vscode): PyCharm 启动命令可配置（支持 ~/绝对路径），抽 expandTilde 复用

GUI 启动的 VS Code 扩展进程 PATH 常不含 JetBrains 启动器，裸 pycharm 易 ENOENT。
新增设置 pycharmCommand（默认 pycharm），贯穿 store/settings handler/messages/
KanbanPanel 与 webview，「钩子」分组在选 PyCharm 时显示「PyCharm 启动命令」输入框。
handleOpenWorktree 用该命令并经 expandTilde 展开 ~。expandTilde 从 resolveWorktreePath
抽出共用。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vscode/src/panel/KanbanPanel.ts

@@ -842,6 +842,7 @@ export class KanbanWebviewPanel {
         autoBuildBranch: s.autoBuildBranch,
         worktreeDirectory: s.worktreeDirectory,
         worktreeOpenWith: s.worktreeOpenWith,
+        pycharmCommand: s.pycharmCommand,
         worktreePostCreateScript: s.worktreePostCreateScript,
         worktreePreRemoveScript: s.worktreePreRemoveScript,
         implTabPreCreateScript: s.implTabPreCreateScript,
@@ -903,6 +904,7 @@ export class KanbanWebviewPanel {
           autoBuildBranch: s.autoBuildBranch,
           worktreeDirectory: s.worktreeDirectory,
           worktreeOpenWith: s.worktreeOpenWith,
+          pycharmCommand: s.pycharmCommand,
           worktreePostCreateScript: s.worktreePostCreateScript,
           worktreePreRemoveScript: s.worktreePreRemoveScript,
           implTabPreCreateScript: s.implTabPreCreateScript,