Add Wiki feature with Markdown, categories, tags, and search

- wiki_categories, wiki_pages, wiki_tags, wiki_page_tags tables
- /wiki overview with category-grouped pages, tag sidebar, search
- /wiki/new create page with Markdown editor and live preview
- /wiki/[slug] view page with rendered Markdown, tags, edit/delete
- /wiki/[slug]/edit with pre-populated editor
- Tag input with existing tag suggestions (click to add)
- Category management (add/delete) in sidebar
- Tailwind Typography plugin for prose styling
- marked package for Markdown rendering
- Sidebar nav item with book icon

Run db:push on server to create wiki tables.

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

src/lib/components/layout/Sidebar.svelte

@@ -58,6 +58,11 @@
 			label: 'Gallery',
 			icon: 'M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z'
 		},
+		{
+			href: '/wiki',
+			label: 'Wiki',
+			icon: 'M12 6.253v13m0-13C10.832 5.477 9.246 5 7.5 5S4.168 5.477 3 6.253v13C4.168 18.477 5.754 18 7.5 18s3.332.477 4.5 1.253m0-13C13.168 5.477 14.754 5 16.5 5c1.747 0 3.332.477 4.5 1.253v13C19.832 18.477 18.247 18 16.5 18c-1.746 0-3.332.477-4.5 1.253'
+		},
 		{
 			href: '/feature-requests',
 			label: 'Requests',

src/lib/server/db/schema.ts

@@ -352,3 +352,54 @@ export const featureRequests = pgTable('feature_requests', {
 	createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
 	updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull()
 });
+
+// ─── Wiki ───────────────────────────────────────────────────────────
+
+export const wikiCategories = pgTable('wiki_categories', {
+	id: uuid('id').defaultRandom().primaryKey(),
+	name: text('name').notNull(),
+	slug: text('slug').unique().notNull(),
+	description: text('description'),
+	sortOrder: integer('sort_order').default(0).notNull(),
+	createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull()
+});
+
+export const wikiPages = pgTable(
+	'wiki_pages',
+	{
+		id: uuid('id').defaultRandom().primaryKey(),
+		title: text('title').notNull(),
+		slug: text('slug').unique().notNull(),
+		content: text('content').notNull(),
+		categoryId: uuid('category_id').references(() => wikiCategories.id, { onDelete: 'set null' }),
+		createdBy: text('created_by'),
+		updatedBy: text('updated_by'),
+		createdAt: timestamp('created_at', { withTimezone: true }).defaultNow().notNull(),
+		updatedAt: timestamp('updated_at', { withTimezone: true }).defaultNow().notNull()
+	},
+	(table) => [
+		index('wiki_pages_category_idx').on(table.categoryId),
+		index('wiki_pages_slug_idx').on(table.slug)
+	]
+);
+
+export const wikiTags = pgTable('wiki_tags', {
+	id: uuid('id').defaultRandom().primaryKey(),
+	name: text('name').unique().notNull()
+});
+
+export const wikiPageTags = pgTable(
+	'wiki_page_tags',
+	{
+		pageId: uuid('page_id')
+			.notNull()
+			.references(() => wikiPages.id, { onDelete: 'cascade' }),
+		tagId: uuid('tag_id')
+			.notNull()
+			.references(() => wikiTags.id, { onDelete: 'cascade' })
+	},
+	(table) => [
+		index('wiki_page_tags_page_idx').on(table.pageId),
+		index('wiki_page_tags_tag_idx').on(table.tagId)
+	]
+);

src/lib/utils/slug.ts

@@ -0,0 +1,9 @@
+export function slugify(text: string): string {
+	return text
+		.toLowerCase()
+		.trim()
+		.replace(/[^\w\s-]/g, '')
+		.replace(/[\s_]+/g, '-')
+		.replace(/^-+|-+$/g, '')
+		.substring(0, 100);
+}