Release OPCUASim v0.4.0 · Karl-Dai/OPCUASim

OPCUASim v0.4.0

🎨 统一视觉系统 / Unified industrial-dark theme + shared widget kit (status_chip, info_row, empty_state, toast_card) across master and server.
🧩 Master UI 全面打磨 / Master UI overhaul: grouped toolbar with shortcut tooltips, status chips on connection list, inline-closable history tabs, friendly empty states.
📈 历史数据可读性提升 / History tab now plots against real timestamps (HH:MM:SS axis), highlights the active quick-range, and shows hover values.
🔧 Server UI 多选 + 防抖编辑 / Server gains Ctrl/Cmd multi-select with bulk delete, right-click "新建子文件夹", and lost-focus property commits (no more per-pixel UpdateNode spam).
🔐 新增 Endpoint Discovery / 证书管理 / 方法调用 / DataChangeFilter / 历史读取 / New since v0.3.0: endpoint discovery, PKI trust manager, method call dialog, DataChangeFilter/deadband, history read raw — all from prior commits, polished and shipped together.
🧹 架构清理 / Cleanup: removed legacy master-frontend/, server-frontend/, crates/opcuamaster-app/ Vue/Tauri leftovers; rewrote release.yml to plain cargo build + softprops/action-gh-release.

opcuaegui-shared::theme — industrial-dark palette (teal accent, status colours) + apply(ctx) / opcuaegui-shared::theme — 工业暗色主题（teal 强调色 + 状态色）+ 一键 apply(ctx).
opcuaegui-shared::widgets — reusable section_label, info_row, status_chip, empty_state, toast_card / 通用展示组件 5 件套，统一两个 app 的视觉.
Master: closable per-tab history view with rounded "browser-tab" visuals / Master 中央 tab 内嵌 ✕ 关闭 + 圆角浏览器风格.
Master: history plot uses real timestamps + active quick-range highlight + hover label / 历史 Plot 时间轴 + 激活范围高亮 + hover tooltip.
Server: Ctrl/Cmd multi-select in node table with bulk-delete chip / 节点表 Ctrl/Cmd 多选 + 顶部批量删除.
Server: right-click "新建子文件夹" on any folder in the address tree / 地址空间任意文件夹右键新建子文件夹.
CI: release.yml extracts the active CHANGELOG section into RELEASE_BODY.md and feeds it to softprops/action-gh-release so the GitHub release page mirrors the changelog / CI 自动从 CHANGELOG 抽取当版本 section 写入 release body.

All toasts now render through widgets::toast_card (rounded card, accent border, theme-aware text) instead of inline Frame::popup / 所有 toast 统一走 toast_card，圆角带强调色描边.
Master toolbar regrouped into Connection / Data / Project / System with shortcut tooltips and a header-side status chip / Master toolbar 按"连接 / 数据 / 项目 / 系统"分组并显示当前选中连接的 status chip.
Master value_panel switches to shared section_label + info_row, drops redundant write-success text in favour of the toast / Master 详情面板改用共享 widget，删除冗余写入提示文本.
Server property editor commits on lost_focus + changed, eliminating per-pixel network spam during DragValue interaction / Server 属性编辑改为 lost_focus + changed 才提交.
Server node_table shows RW in accent colour + selection chip; address tree, status bar and toolbar all migrate to theme constants / Server 节点表 RW 强调色，状态栏/工具栏/地址树统一用主题常量.
README/README_CN rewritten to reflect the actual egui-based architecture (no more Tauri/Vue references) / README 重写为反映实际 egui 架构.

Connection-tree state badge is now an actual chip (background + border + label) instead of a single hard-to-read coloured dot / 连接树状态徽章改为完整的 chip（背景+描边+文字），不再只有难辨识的彩色圆点.
Browse panel and data table no longer show bare (无数据) strings; they render proper empty_state cards with guidance / 浏览面板/监控表移除裸的 (无数据) 文案，改为带操作引导的空状态卡片.

Deleted orphan master-frontend/ and server-frontend/ directories (Vue dist remains, no source) / 删除孤立的 master-frontend/ 与 server-frontend/ 目录.
Deleted empty crates/opcuamaster-app/ (Tauri shell from the pre-rewrite era) / 删除空壳 crates/opcuamaster-app/.
Removed model::ValuePanelState::last_result rendering — toast already covers it / 移除 value_panel.last_result 的冗余渲染.

Added subfolder_inputs: HashMap<String, String> and selected_node_ids: HashSet<String> to server AppModel to back the new sub-folder + multi-select flows / 新增字段支撑子文件夹与多选.
All clippy -D warnings clean across the workspace; full test suite passes (28 tests, 0 failed) / 全 workspace clippy -D warnings 通过；测试套件 28 个全绿.

Full changelog: CHANGELOG.md