fix(ui): move nav toggle to right side of InputBar, make it larger

- Add rightAction snippet prop to QuickInputBar (InputBar.svelte)
- Move toggle from leftAction to rightAction (renders after submit button)
- Increase toggle size from 28px to 36px for better tap target

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/manacore/apps/web/src/routes/(app)/+layout.svelte

@@ -408,7 +408,7 @@
 				highlightPatterns={inputBarAdapter.highlightPatterns}
 				positioning="static"
 			>
-				{#snippet leftAction()}
+				{#snippet rightAction()}
 					<button
 						class="pill-nav-toggle"
 						onclick={() => handleCollapsedChange(!isCollapsed)}
@@ -533,8 +533,8 @@
 	}
 
 	.pill-nav-toggle {
-		width: 28px;
-		height: 28px;
+		width: 36px;
+		height: 36px;
 		flex-shrink: 0;
 		border-radius: 50%;
 		border: none;