fix(touch): harden long-press for iOS (#199)

Long-press opens the message action sheet (#166), but on iOS the system
takes a long-press for itself: the link/image callout or the text-selection
loupe races the 450 ms press. Message rows on touch screens now carry
data-touch-actions (no -webkit-touch-callout), and the pressed row carries
data-pressing from touch-down until the finger lifts, which turns text
selection off for that moment only. Copy Text stays in the sheet.

Refs #199

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/features/room/message/styles.css.ts

@@ -1,4 +1,4 @@
-import { style } from '@vanilla-extract/css';
+import { globalStyle, style } from '@vanilla-extract/css';
 import { DefaultReset, FocusOutline, color, config, toRem } from 'folds';
 
 export const MessageBase = style({
@@ -77,3 +77,14 @@ export const ReactionsMore = style([
 export const ReactionsTooltipText = style({
   wordBreak: 'break-word',
 });
+
+// [Gitea #199] Long-press opens the message action sheet on touch screens. On
+// iOS a long-press otherwise belongs to the system: a link/image callout, or
+// the text-selection loupe, both of which race (and win against) the 450 ms
+// press. No callout on message rows, and no selection while a finger is
+// down; copying text is in the sheet.
+globalStyle('[data-touch-actions]', { WebkitTouchCallout: 'none' });
+globalStyle('[data-touch-actions][data-pressing], [data-touch-actions][data-pressing] *', {
+  userSelect: 'none',
+  WebkitUserSelect: 'none',
+});