v0.9.0 — GUI redesign: sidebar, Settings page, refreshed style

What's new — GUI redesign: sidebar navigation, Settings page, refreshed style

The main window used to be one long scrolling column with everything crammed onto it — engine controls, rule list, and activity log all stacked together. It's now organized into a sidebar with three focused pages:

• Rules — engine start/stop and the rule list (unchanged content, just its own page now).
• Activity — the live event log, full-page instead of squeezed at the bottom.
• Settings (new) — language switcher, the app's own version number, and the Help panel trigger, all pulled out of the cramped status bar into one dedicated place.

Other changes:

• Icon-based language switcher: the "中文"/"EN" text buttons are now icon buttons (using the language icon from the project's design resources), rendered via a CSS mask so the icon always matches the current text colour exactly instead of an approximate filter-based tint.
• App version display: Settings now shows the running app's actual version, via a new app:get-version bridge — this is also the plumbing a future in-app update checker will reuse.
• Refreshed toggle switches: every on/off setting in the app (dry-run, whole-screen scanning, once-per-appearance, rule enabled) is now a pill-style toggle switch instead of a bare browser checkbox — loosely inspired by community reference designs in the project's resources (not copied verbatim; one consistent visual style applied throughout).

No behavior changes to rules, triggers, or actions — this release is purely about how the app is organized and looks.

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新功能 — GUI 重新設計：側邊欄導覽、設定頁、視覺風格更新

主視窗原本是一個很長的捲動頁面，把引擎控制、規則清單、活動紀錄全部疊在一起。現在改成側邊欄 + 三個各自獨立的頁面：

• 規則 —— 引擎啟動/停止跟規則清單（內容不變，只是變成獨立頁面）。
• 活動紀錄 —— 即時事件紀錄，改成整頁顯示，不再擠在畫面最下面。
• 設定（新增）—— 語言切換、App 自己的版本號，以及說明面板的入口，全部從原本擁擠的狀態列搬到這個獨立的地方。

其他變動：

• 語言切換改成圖示：原本「中文」/「EN」的純文字按鈕，換成用語言圖示（取自專案的設計素材）做的圖示按鈕，用 CSS mask 渲染，讓圖示顏色永遠精確跟隨目前的文字顏色，而不是用大概湊色的濾鏡效果。
• App 版本顯示：設定頁現在會顯示目前執行中 App 的實際版本號，透過新增的 app:get-version 橋接取得——這也是之後App 內建更新檢查功能會直接複用的管線。
• 切換開關視覺更新：App 裡所有開關型設定（dry-run、全螢幕掃描、每次出現觸發一次、規則啟用）都從瀏覽器原生的核取方塊，換成藥丸形切換開關 —— 靈感來自專案設計素材裡的社群參考範例（不是照抄，而是挑出一套一致的視覺語言套用到全App）。

規則、觸發條件、動作的行為完全沒有變動 —— 這次發佈純粹是介面組織方式與外觀的更新。