The Material Design 3 shell — removed

This article is a record of something that is not in the application. It is kept so the removal reads as a decision rather than an oversight, and so the next person who finds a stray reference to Md3Shell knows what happened to it.

Do not use this as a specification. The chrome the application renders is the chrome that was already chosen, and it is frozen: see "The interface shell is frozen — never restyle it unprompted" in AGENTS.md. This shell has been built twice without being asked for and reverted twice. app/test/unit/interface-shell-frozen-test.ts is the executable version of that decision, and it fails by name if any of the removed modules reappears.

What it was

Between two commits in August 2026 the application chrome was rewritten against a design file called History MD3.dc.html and assembled as a single Md3Shell component that App.renderApp() rendered: an application header, a navigation drawer, a pane header, eight destinations, and a set of filterable menus and overlays. It was integrated by Integrate the Material Design 3 shell (07f38872ab).

What happened to it

Take the interface back to the chrome that was already chosen (3abcee9015) removed it on 2026-08-19, along with the view components, the shell stylesheets, and the design-parity test that walked the design file. The design file itself was removed from design/ by Update design system (bd6e7f4f58) on 2026-08-21; design/Desktop Material v2.dc.html is the design reference the project uses now.

None of it is recoverable from the tree — it lives only in history. The removed modules are listed by name in app/test/unit/interface-shell-frozen-test.ts, which is the authoritative list.

What survived, and is still real

The Material Design 3 controls and dialogs were kept deliberately; only the shell around them was removed. They are documented in their own articles:

app/test/unit/interface-shell-frozen-test.ts also asserts that each surviving control is still present, so an over-applied revert fails just as loudly as a rebuild.

What this article no longer describes

Earlier revisions of this article documented a "Show the classic toolbar" setting in Settings → Appearance, backed by a show-classic-toolbar local storage key and a classic-toolbar module. That setting was part of the shell and went with it: no such module, storage key or Appearance row exists. Its localized strings survive in app/src/lib/i18n-resources.ts with nothing reading them.

It also documented a design-parity conformance test over the removed design file. That test does not exist.

app/src/lib/md3-view-preferences.ts — the six presentation preferences the shell's menus flipped — is still in the tree but has no consumer, because the surfaces that read it were the ones removed. It is dead code, not a feature.

Material Design 3 外殼 — 已移除

呢篇係一個已經唔喺應用程式入面嘅嘢嘅紀錄。留低佢，係為咗令呢次移除讀落係一個決定，而唔係一個疏忽；亦都係為咗下一個撞到 Md3Shell 殘留引用嘅人知道發生咗咩事。

唔好當佢係規格。 應用程式 render 緊嘅框架，就係早已揀定嗰個，而且係凍結咗嘅：睇 AGENTS.md 入面 "The interface shell is frozen" 嗰節。呢個外殼冇人叫過就砌咗兩次，亦都 revert 咗兩次。 app/test/unit/interface-shell-frozen-test.ts 就係呢個決定嘅可執行版本，任何一個被移除嘅模組返嚟，佢就會指名報錯。

佢曾經係咩

2026 年 8 月，應用程式框架照住一個叫 History MD3.dc.html 嘅設計檔重寫，砌成一個 Md3Shell 組件俾 App.renderApp() render：頂部列、側邊導航、內容標題列、八個目的地，加一堆可以篩選嘅選單同浮層。由 commit 07f38872ab 整合入去。

之後點

Commit 3abcee9015 喺 2026-08-19 將佢連同啲 view 組件、外殼樣式同設計對照測試一齊移除。設計檔本身喺 2026-08-21 由 commit bd6e7f4f58 從 design/ 刪走；而家用嘅設計參考係 design/Desktop Material v2.dc.html。

樹入面已經冇得還原，淨係喺 git 歷史入面。被移除嘅模組清單以 app/test/unit/interface-shell-frozen-test.ts 為準。

咩留低咗

Material Design 3 嘅控制項同對話框係特登留低嘅，淨係外殼被移除。佢哋各有自己嘅文章：破壞性操作確認閘、regex builder、指令板、離線文件瀏覽器、搞笑程度滑桿。同一個測試亦都會檢查每個留低嘅控制項仲喺度，所以 revert 過咗頭一樣會報錯。

呢篇唔再描述嘅嘢

之前嘅版本寫過 Settings → Appearance 有個「顯示經典工具列」設定，用 show-classic-toolbar local storage key。嗰個設定係外殼嘅一部分，一齊被移除咗：冇對應嘅模組、key 或者設定列。佢嘅翻譯字串仲留喺 app/src/lib/i18n-resources.ts，但係冇人讀。

之前亦寫過一個對住已刪除設計檔嘅對照測試。嗰個測試唔存在。

app/src/lib/md3-view-preferences.ts 仲喺樹入面，但係讀佢嘅介面已經被移除，所以佢係死碼，唔係功能。