Merge pull request #730: fix(file-preview): let rendered Markdown fill the resized window

src/web/public/styles.css

@@ -12571,13 +12571,21 @@ html:is([data-skin="paper-gray"], [data-skin="solarized-light"], [data-skin="cat
 
 /* ---- File Viewer rendered markdown ----
    Styling comes from the Response Viewer's .rv-text rules; .rv-text itself
-   carries no padding or base font (the chat card supplies those). */
+   carries no padding or base font (the chat card supplies those).
+
+   No width cap. The window is whatever the user drags or expands it to, so the
+   document must reflow to fill it; the fixed 960px reading column this rule
+   shipped before the resize grip existed stops reflow once the window is wider
+   than the cap. --rv-content-max: none lets ASCII-diagram blocks
+   (.rv-text .rv-diagram-wrap, capped by that variable with a 720px fallback
+   meant for the Response Viewer) follow the rest of the document too. Pinned by
+   test/file-preview-window.test.ts. */
 
 .file-preview-body > .file-preview-md {
   padding: 1rem 1.25rem 2rem;
   font-size: 15px;
   line-height: 1.55;
-  max-width: 960px;
+  --rv-content-max: none;
 }
 
 /* Relative links in the document are rebased onto a.rv-path so the Response