chore(edit-schema): tighten welcome heading spacing

Wrap title and subtitle in a single heading block with its own 4px gap so
"Describe what you need and AI will generate the SQL" sits right under
"Create your first table" instead of inheriting the 16px welcome gap.
Drop the trailing period from the subtitle.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: karinakharchenko

frontend/src/app/components/edit-database-schema/edit-database-schema.component.css

@@ -122,6 +122,13 @@
 	text-align: center;
 }
 
+.schema-editor__welcome-heading {
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+	gap: 4px;
+}
+
 .schema-editor__welcome-subtitle {
 	font-size: 14px;
 	color: rgba(0, 0, 0, 0.5);

frontend/src/app/components/edit-database-schema/edit-database-schema.component.html

@@ -35,8 +35,10 @@ <h1 class="schema-editor__title">Edit Database Schema</h1>
 					<div class="schema-editor__welcome-icon-box">
 						<mat-icon class="schema-editor__welcome-icon">schema</mat-icon>
 					</div>
-					<p class="schema-editor__welcome-title">Create your first table</p>
-					<p class="schema-editor__welcome-subtitle">Describe what you need and AI will generate the SQL.</p>
+					<div class="schema-editor__welcome-heading">
+						<p class="schema-editor__welcome-title">Create your first table</p>
+						<p class="schema-editor__welcome-subtitle">Describe what you need and AI will generate the SQL</p>
+					</div>
 
 					<div class="schema-editor__suggestions-block">
 					<p class="schema-editor__suggestions-heading">or use a template</p>