✨ 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/settings/store.ts

@@ -100,6 +100,13 @@ export interface Settings {
    * `'vscode'` (default) opens a new VS Code window.
    */
   worktreeOpenWith: 'vscode' | 'pycharm'
+  /**
+   * Command used to launch PyCharm when `worktreeOpenWith === 'pycharm'`.
+   * A bare name relies on PATH, which a GUI-launched VS Code often lacks, so
+   * an absolute path (or a `~`-prefixed one) is the reliable choice. Empty
+   * means "use the default `pycharm`".
+   */
+  pycharmCommand: string
   /**
    * Path to a user-provided shell script that runs *after* the extension
    * creates a worktree via `git worktree add`. Empty string means use the
@@ -173,6 +180,7 @@ function defaults(ctx: ExtensionContext): Settings {
     autoBuildBranch: '',
     worktreeDirectory: '~/Sources/worktree/$project_name/$feature_name',
     worktreeOpenWith: 'vscode',
+    pycharmCommand: 'pycharm',
     worktreePostCreateScript: '',
     worktreePreRemoveScript: '',
     implTabPreCreateScript: '',
@@ -226,6 +234,11 @@ export function getSettings(ctx: ExtensionContext): Settings {
   const worktreeOpenWith = stored.worktreeOpenWith === 'pycharm' || stored.worktreeOpenWith === 'vscode'
     ? stored.worktreeOpenWith
     : base.worktreeOpenWith
+  // pycharm launcher command: blank means "use the default `pycharm`", so fall
+  // back to base rather than preserving an empty string.
+  const pycharmCommand = typeof stored.pycharmCommand === 'string' && stored.pycharmCommand.length > 0
+    ? stored.pycharmCommand
+    : base.pycharmCommand
   // worktree hook script paths: '' is meaningful (= "use default
   // .spx/worktree-*.sh"), so don't coerce. Non-string legacy values fall
   // back to ''. The hook runner resolves '' to the default at execution
@@ -266,6 +279,7 @@ export function getSettings(ctx: ExtensionContext): Settings {
     autoBuildBranch,
     worktreeDirectory,
     worktreeOpenWith,
+    pycharmCommand,
     worktreePostCreateScript,
     worktreePreRemoveScript,
     implTabPreCreateScript,