fix(files): decode markdown refs, scope links to the preview session, drop name= from the sanitizer

Review follow-up on #503. marked percent-encodes link and image destinations, and the rebase pass encoded them a second time, so a space or a CJK character in a file name made file-raw look for a file literally named my%20image.png; refs are now decoded once (a malformed escape is kept as written) and stripped of ?query along with #fragment. Root-relative refs resolve from the workspace root as on GitHub instead of falling through as Codeman URLs. Rebased links carry the preview's own session id and the response-viewer delegate prefers it, so a document opened from another session's attachment card opens its links in that workspace rather than the active tab's.

The sanitizer no longer allows name=: marked never emits it, and <img name="app"> made document.app that image, which every inline onclick="app.…()" handler resolves before the global, so one rendered README broke every viewer button until a reload. Adds the zh-CN strings for the three toolbar titles.

src/web/public/sanitize-html.js

@@ -84,7 +84,10 @@
   /**
    * Attributes allowed on the tags above. `style` is intentionally absent (CSS-based vectors).
    * `class`/`id` survive because the response viewer adds wrapper classes downstream and code
-   * blocks may carry `language-*` classes from marked.
+   * blocks may carry `language-*` classes from marked. `name` is absent on purpose: marked never
+   * emits it, and `<img name="app">` would make `document.app` that image, which every inline
+   * `onclick="app.…()"` handler resolves before the global (DOM clobbering), so one rendered
+   * README could break every button until a reload.
    */
   var ALLOWED_ATTR = [
     'href',
@@ -93,7 +96,6 @@
     'title',
     'class',
     'id',
-    'name',
     'colspan',
     'rowspan',
     'align',