fix(dashboard): keep the reply name and map preview inside the panel - #1429

Two elements in the chat pane carry no width constraint of their own, so once the room is narrow they paint through their neighbours and out past .chats-layout's clip. Neither is caused by the composer work in #1425 or #1427; both are pre-existing.

What changed

• .chats-page .replying-to-title gains white-space: nowrap, overflow: hidden and text-overflow: ellipsis. It was the only text node in the reply banner without them; its own sibling .replying-to-body has had all three all along.
• The location message's map preview moves from an inline style={{ maxWidth: 220, ... }} to a .chats-page .chat-location-media class with max-width: min(220px, 100%). It keeps the same 220px cap but is now bounded by the bubble, which is how every other media element in a bubble is already sized. min() follows the existing use in CustomSelect.css.

Impact

Measured in headless Chromium with the real webfont and the production globals, navigation expanded. 889px is the narrowest viewport at which the two-pane layout survives once #1427 lands, and 243px is the room there.

Reply banner, quoted name with no break opportunity, measured from the text's own rectangle because the element box reports no overflow at all:

After, the title is clipped inside its box and shows an ellipsis. The discriminating evidence is structural plus visual, not the rectangle: scrollWidth 385 against clientWidth 133 with a non-visible overflow, and the two screenshots hash differently. A Range rectangle is the wrong instrument here, since it is not clipped by an ancestor's overflow and reports where the text would sit rather than where it paints.

Map preview:

The cap still binds wherever there is room for it, so nothing changes on an ordinary desktop width.

Verification

• Both tables above measured on the branch files themselves against main.
• The map preview is unchanged at 960px and wider, so the visual size on a normal window is untouched.
• The reply title change is visible in pixels, confirmed by differing screenshot hashes at 889px.
• Dashboard lane locally: lint, format:check, typecheck, i18n:check, build, test:unit. Docs lane test:docs, 264 tests. The page-CSS scope gate passes, 11 of 11.
• Removing the inline style let Prettier collapse the JSX onto one line; that reformat is in the diff and format:check is clean.

Note

The changelog entry sits at the same anchor as the one in #1427. Whichever lands second needs a one line rebase there, and a conflicted PR in this repository gets no CI run at all while reporting "no checks reported", so re-check it after rebasing.

Fixes #1428