✨ 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/webview-ui/src/hooks/useIssues.ts

@@ -35,6 +35,7 @@ export interface SettingsValues {
   autoBuildBranch: string
   worktreeDirectory: string
   worktreeOpenWith: 'vscode' | 'pycharm'
+  pycharmCommand: string
   worktreePostCreateScript: string
   worktreePreRemoveScript: string
   implTabPreCreateScript: string
@@ -59,6 +60,7 @@ export interface SettingsOverlayState {
   autoBuildBranch: string
   worktreeDirectory: string
   worktreeOpenWith: 'vscode' | 'pycharm'
+  pycharmCommand: string
   worktreePostCreateScript: string
   worktreePreRemoveScript: string
   implTabPreCreateScript: string
@@ -271,6 +273,7 @@ export function useIssues(): UseIssuesResult {
       autoBuildBranch: values.autoBuildBranch,
       worktreeDirectory: values.worktreeDirectory,
       worktreeOpenWith: values.worktreeOpenWith,
+      pycharmCommand: values.pycharmCommand,
       worktreePostCreateScript: values.worktreePostCreateScript,
       worktreePreRemoveScript: values.worktreePreRemoveScript,
       implTabPreCreateScript: values.implTabPreCreateScript,
@@ -598,6 +601,7 @@ export function useIssues(): UseIssuesResult {
             autoBuildBranch: msg.autoBuildBranch,
             worktreeDirectory: msg.worktreeDirectory,
             worktreeOpenWith: msg.worktreeOpenWith,
+            pycharmCommand: msg.pycharmCommand,
             worktreePostCreateScript: msg.worktreePostCreateScript,
             worktreePreRemoveScript: msg.worktreePreRemoveScript,
             implTabPreCreateScript: msg.implTabPreCreateScript,