Update blog post dates to 2025 and add local visit counter

[magic-alt]

Summary

• update all four blog post filenames and front matter dates to 2025, setting the harmonic drive article to 2025-10-27
• surface a sidebar entry that displays the per-device visit count for each post
• load a new visit-tracker script from the footer to manage localStorage-backed view tracking

Testing

• bundle exec jekyll build (fails: bundler: command not found)

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https://chatgpt.com/codex/tasks/task_e_68fee311ae6083288407b53ca302fe48

[Copilot]

Pull Request Overview

This PR updates blog post dates from 2024 to 2025 and adds a client-side visit tracking feature using localStorage. The harmonic drive article is specifically set to October 27, 2025.

• Updates front matter dates in four blog post files from 2024 to 2025
• Implements a localStorage-based visit counter displayed in the post sidebar
• Adds a new JavaScript module to track and persist page view counts per device

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
assets/js/visit-tracker.js	New script implementing localStorage-based visit counting with Chinese UI text
_posts/2025-10-27-harmonic-drive-summary.md	Date updated from 2024-10-30 to 2025-10-27
_posts/2025-10-17-neovim-cpp-setup.md	Date updated from 2024-10-17 to 2025-10-17
_posts/2025-04-15-motor-control-foundations.md	Date updated from 2024-04-15 to 2025-04-15
_posts/2025-01-01-welcome.md	Date updated from 2024-01-01 to 2025-01-01
_layouts/post.html	Adds sidebar entry displaying visit count with placeholder text
_includes/footer.html	Loads visit-tracker.js script with defer attribute

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[Copilot]

The null check parsed is redundant after checking typeof parsed === 'object' since typeof null === 'object' evaluates to true. The order should be reversed: check truthiness first, then type. Change to if (parsed && typeof parsed === 'object') to avoid potential null issues.

Suggested change

	if (typeof parsed === 'object' && parsed) {
	if (parsed && typeof parsed === 'object') {

[Copilot]

Corrected spelling of '计数' to '计算' (the excerpt should read '关键计算参数' meaning 'key calculation parameters' rather than '关键计数参数' which means 'key counting parameters').

Suggested change

	excerpt: 汇总谐波减速机的工作原理、性能特性、关键计数参数与选型应用要点，便于快速查阅与工程实践。
	excerpt: 汇总谐波减速机的工作原理、性能特性、关键计算参数与选型应用要点，便于快速查阅与工程实践。