✨ feat(vscode): worktree 打开方式可选 VS Code/PyCharm，并修复 handleOpenWorktree 不展开 ~ 的打开报错

- worktree.ts: handleOpenWorktree/handleDeleteWorktree/dispatchImplTabPostCloseAsync 三处改用 resolveWorktreePath，修复带 ~ 的存量路径被拼成 <工作区>/~/... 导致打不开
- 新增全局设置 worktreeOpenWith（'vscode' | 'pycharm'，默认 vscode），贯穿 store/settings handler/messages/KanbanPanel 与 webview 的 messages/useIssues/App/SettingsModal「钩子」分组新增「工作树打开方式」下拉
- handleOpenWorktree 按设置分支：pycharm 走 JetBrains pycharm 启动器，ENOENT 时提示启用命令行启动器

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

vscode/webview-ui/src/App.tsx

@@ -446,6 +446,7 @@ export function App() {
         initialDevBranch={settings?.devBranch ?? 'main'}
         initialAutoBuildBranch={settings?.autoBuildBranch ?? ''}
         initialWorktreeDirectory={settings?.worktreeDirectory ?? ''}
+        initialWorktreeOpenWith={settings?.worktreeOpenWith ?? 'vscode'}
         initialWorktreePostCreateScript={settings?.worktreePostCreateScript ?? ''}
         initialWorktreePreRemoveScript={settings?.worktreePreRemoveScript ?? ''}
         initialImplTabPreCreateScript={settings?.implTabPreCreateScript ?? ''}