tidy AppConfig types, md-it shims, dead CSS

src/lib/components/NoteList.svelte

@@ -1841,21 +1841,6 @@
 		padding: 2px 8px 4px;
 	}
 
-	.tag-edit-input {
-		width: 100%;
-		padding: 4px 8px;
-		border: 1px solid var(--border-color);
-		border-radius: 4px;
-		background: var(--bg-secondary);
-		color: var(--text-primary);
-		font-size: 12px;
-		outline: none;
-	}
-
-	.tag-edit-input:focus {
-		border-color: var(--accent);
-	}
-
 	.tag-edit-list {
 		max-height: 160px;
 		overflow-y: auto;

src/lib/shims.d.ts

@@ -0,0 +1,5 @@
+// Ambient type shims for markdown-it plugins that ship without their own TypeScript
+// declarations. Type-only; no runtime effect.
+declare module 'markdown-it-mark';
+declare module 'markdown-it-sub';
+declare module 'markdown-it-sup';

src/lib/types.ts

@@ -65,6 +65,7 @@ export interface AppConfig {
   pdf_height: number;
   title_mode: string;
   hide_title_in_body: boolean;
+  show_line_numbers: boolean;
   backup_enabled: boolean;
   backup_frequency: string;
   backup_max_count: number;
@@ -83,6 +84,7 @@ export interface AppConfig {
   ai_writing_style: string | null;
   default_view_mode: boolean;
   show_tray_icon: boolean;
+  close_to_tray: boolean;
   enable_wiki_links: boolean;
   restore_last_session: boolean;
   sync_provider: string | null;