fix(issue-details): Remove grid gap when badge is absent

Changed Title component from CSS Grid to Flexbox to prevent column-gap
from being applied when FeatureBadge is not rendered. This ensures the
primary title has full available space for non-LLM issues.

Co-authored-by: Armen Zambrano G. <armenzg@users.noreply.github.com>

Author: cursoragent

static/app/views/issueDetails/streamline/header/header.tsx

@@ -326,7 +326,8 @@ const PrimaryTitle = styled('span')`
   white-space: nowrap;
   font-size: 20px;
   font-weight: ${p => p.theme.font.weight.sans.medium};
-  flex-shrink: 0;
+  flex-shrink: 1;
+  min-width: 0;
 `;
 
 const StatTitle = styled('div')`
@@ -410,10 +411,10 @@ const Workflow = styled('div')`
 `;
 
 const Title = styled('div')`
-  display: grid;
-  grid-template-columns: minmax(0, max-content) min-content;
+  display: flex;
   align-items: center;
-  column-gap: ${p => p.theme.space.sm};
+  gap: ${p => p.theme.space.sm};
+  min-width: 0;
 `;
 
 const StyledBreadcrumbs = styled(Breadcrumbs)`