🐛 fix(vscode): worktreePath 消费侧统一解析 ~/绝对/相对，修复带 ~ 的存量工单与绝对路径 worktree 误判

新增 resolveWorktreePath(stored, workspaceRoot) 三态合一解析：开头 ~ 展开为 home、
已是绝对原样、相对拼到 workspaceRoot。替换全部消费点，原先「判 isAbsolute 再 join」
不认 ~、issueLoader 算 worktreeExists 更是裸 join 连绝对路径都拼坏。

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

vscode/src/gitea/issueLoader.ts

@@ -19,6 +19,7 @@
 
 import * as fs from 'node:fs'
 import * as path from 'node:path'
+import { resolveWorktreePath } from '../git/worktree'
 import type { GiteaComment, GiteaIssue } from './api'
 import type { Issue, IssueColumn } from './types'
 import {
@@ -354,7 +355,7 @@ async function buildIssue(opts: {
   let worktreeExists: boolean | undefined
   if (worktreePath && workspaceRoot) {
     try {
-      worktreeExists = fs.existsSync(path.join(workspaceRoot, worktreePath))
+      worktreeExists = fs.existsSync(resolveWorktreePath(worktreePath, workspaceRoot))
     }
     catch {
       worktreeExists = false