feat: add show command with short-index cache

Persist last displayed tweet lists and allow opening a tweet by index.

- Add twitter_cli/cache.py: stores a short-index cache (~/.twitter-cli/last_results.json) with a 1h TTL and helpers to resolve index->tweet-id and cache size.
- Update twitter_cli/cli.py: save list results to cache, display a hint, and add `twitter show <N>` command which fetches a tweet by cached index and prints detail/replies (supports --full-text, --json, structured output, and max replies).
- Update README.md and SKILL.md to document the new `show` usage.
- Add .idea/ to .gitignore and bump package version in uv.lock to 0.8.0.

This change makes it easy to open items from the last feed/search without copying IDs.

README.md

@@ -23,7 +23,7 @@ A terminal-first CLI for Twitter/X: read timelines, bookmarks, and user profiles
 - Timeline: fetch `for-you` and `following` feeds
 - Bookmarks: list saved tweets from your account
 - Search: find tweets by keyword with Top/Latest/Photos/Videos tabs
-- Tweet detail: view a tweet and its replies
+- Tweet detail: view a tweet and its replies; use `show <N>` to open tweet #N from the last list output
 - Article: fetch a Twitter Article and export it as Markdown
 - List timeline: fetch tweets from a Twitter List
 - User lookup: fetch user profile, tweets, likes, followers, and following
@@ -122,6 +122,11 @@ twitter tweet 1234567890
 twitter tweet 1234567890 --full-text
 twitter tweet https://x.com/user/status/1234567890
 
+# Open tweet by index from last list output
+twitter show 2                         # Open tweet #2 from last feed/search
+twitter show 2 --full-text             # Full text in reply table
+twitter show 2 --json                  # Structured output
+
 # Twitter Article
 twitter article 1234567890
 twitter article https://x.com/user/article/1234567890 --json
@@ -358,7 +363,7 @@ After installation, OpenClaw can call `twitter-cli` commands directly.
 - 时间线读取：支持 `for-you` 和 `following`
 - 收藏读取：查看账号书签推文
 - 搜索：按关键词搜索推文，支持 Top/Latest/Photos/Videos
-- 推文详情：查看推文及其回复
+- 推文详情：查看推文及其回复；用 `show <N>` 可直接打开上次列表里的第 N 条推文
 - 文章读取：获取 Twitter 长文，并导出为 Markdown
 - 列表时间线：获取 Twitter List 的推文
 - 用户查询：查看用户资料、推文、点赞、粉丝和关注
@@ -425,6 +430,11 @@ twitter search "trending" --filter              # 启用排序筛选
 twitter tweet 1234567890
 twitter tweet 1234567890 --full-text
 
+# 通过序号打开上次列表里的推文
+twitter show 2                         # 打开上次 feed/search 的第 2 条
+twitter show 2 --full-text             # 在回复表格里显示完整正文
+twitter show 2 --json                  # 结构化输出
+
 # Twitter 长文
 twitter article 1234567890
 twitter article https://x.com/user/article/1234567890 --json