feat: add user preferences system

Implement 4 user preferences (default note mode, default note color,
hide footer, sidebar default state) with offline-first localStorage
backed by server-side key-value storage.

- Add user_preferences table (EAV pattern with unique user_id+key index)
- Create server service with get/upsert operations
- Add GET/PUT /api/preferences endpoints
- Build Svelte 5 runes-based client store (.svelte.ts)
- Wire preferences into app layout (footer toggle, sidebar state)
- Wire default note mode/color into NoteEditor for new notes
- Add Preferences tab as first item in Settings navigation
- Add 7 unit tests and 4 E2E tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

drizzle/0002_deep_black_widow.sql

@@ -0,0 +1,114 @@
+CREATE TABLE `api_keys` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` integer NOT NULL,
+	`name` text NOT NULL,
+	`key_hash` text NOT NULL,
+	`key_prefix` text NOT NULL,
+	`created_at` integer NOT NULL,
+	`last_used_at` integer,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+CREATE TABLE `note_collaborators` (
+	`note_id` text NOT NULL,
+	`user_id` integer NOT NULL,
+	`added_by` integer NOT NULL,
+	`added_at` integer NOT NULL,
+	FOREIGN KEY (`note_id`) REFERENCES `notes`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action,
+	FOREIGN KEY (`added_by`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `note_collaborators_unique` ON `note_collaborators` (`note_id`,`user_id`);--> statement-breakpoint
+CREATE INDEX `note_collaborators_user_id_idx` ON `note_collaborators` (`user_id`);--> statement-breakpoint
+CREATE TABLE `note_user_state` (
+	`note_id` text NOT NULL,
+	`user_id` integer NOT NULL,
+	`pinned` integer DEFAULT false NOT NULL,
+	`archived` integer DEFAULT false NOT NULL,
+	`sort_order` integer DEFAULT 0 NOT NULL,
+	FOREIGN KEY (`note_id`) REFERENCES `notes`(`id`) ON UPDATE no action ON DELETE cascade,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `note_user_state_unique` ON `note_user_state` (`note_id`,`user_id`);--> statement-breakpoint
+CREATE TABLE `user_preferences` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`user_id` integer NOT NULL,
+	`key` text NOT NULL,
+	`value` text NOT NULL,
+	`updated_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX `user_preferences_user_key_unique` ON `user_preferences` (`user_id`,`key`);--> statement-breakpoint
+PRAGMA foreign_keys=OFF;--> statement-breakpoint
+CREATE TABLE `__new_attachments` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` integer DEFAULT 0 NOT NULL,
+	`note_id` text NOT NULL,
+	`filename` text NOT NULL,
+	`mime_type` text NOT NULL,
+	`size` integer NOT NULL,
+	`path` text NOT NULL,
+	`thumbnail_path` text,
+	`featured` integer DEFAULT false NOT NULL,
+	`created_at` integer NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action,
+	FOREIGN KEY (`note_id`) REFERENCES `notes`(`id`) ON UPDATE no action ON DELETE cascade
+);
+--> statement-breakpoint
+INSERT INTO `__new_attachments`("id", "user_id", "note_id", "filename", "mime_type", "size", "path", "thumbnail_path", "featured", "created_at") SELECT "id", "user_id", "note_id", "filename", "mime_type", "size", "path", "thumbnail_path", "featured", "created_at" FROM `attachments`;--> statement-breakpoint
+DROP TABLE `attachments`;--> statement-breakpoint
+ALTER TABLE `__new_attachments` RENAME TO `attachments`;--> statement-breakpoint
+PRAGMA foreign_keys=ON;--> statement-breakpoint
+CREATE TABLE `__new_notes` (
+	`id` text PRIMARY KEY NOT NULL,
+	`user_id` integer DEFAULT 0 NOT NULL,
+	`title` text DEFAULT '' NOT NULL,
+	`content` text DEFAULT '' NOT NULL,
+	`color` text DEFAULT 'default' NOT NULL,
+	`pinned` integer DEFAULT false NOT NULL,
+	`archived` integer DEFAULT false NOT NULL,
+	`trashed` integer DEFAULT false NOT NULL,
+	`trashed_at` integer,
+	`checklist_mode` integer DEFAULT false NOT NULL,
+	`sort_order` integer DEFAULT 0 NOT NULL,
+	`created_at` integer NOT NULL,
+	`updated_at` integer NOT NULL,
+	`version` integer DEFAULT 1 NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+INSERT INTO `__new_notes`("id", "user_id", "title", "content", "color", "pinned", "archived", "trashed", "trashed_at", "checklist_mode", "sort_order", "created_at", "updated_at", "version") SELECT "id", "user_id", "title", "content", "color", "pinned", "archived", "trashed", "trashed_at", "checklist_mode", "sort_order", "created_at", "updated_at", "version" FROM `notes`;--> statement-breakpoint
+DROP TABLE `notes`;--> statement-breakpoint
+ALTER TABLE `__new_notes` RENAME TO `notes`;--> statement-breakpoint
+CREATE INDEX `notes_user_id_idx` ON `notes` (`user_id`);--> statement-breakpoint
+CREATE INDEX `notes_trashed_archived_idx` ON `notes` (`trashed`,`archived`);--> statement-breakpoint
+CREATE INDEX `notes_updated_at_idx` ON `notes` (`updated_at`);--> statement-breakpoint
+CREATE TABLE `__new_sync_log` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`user_id` integer DEFAULT 0 NOT NULL,
+	`note_id` text NOT NULL,
+	`operation` text NOT NULL,
+	`timestamp` integer NOT NULL,
+	`client_id` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action,
+	FOREIGN KEY (`note_id`) REFERENCES `notes`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+INSERT INTO `__new_sync_log`("id", "user_id", "note_id", "operation", "timestamp", "client_id") SELECT "id", "user_id", "note_id", "operation", "timestamp", "client_id" FROM `sync_log`;--> statement-breakpoint
+DROP TABLE `sync_log`;--> statement-breakpoint
+ALTER TABLE `__new_sync_log` RENAME TO `sync_log`;--> statement-breakpoint
+CREATE INDEX `sync_log_timestamp_idx` ON `sync_log` (`timestamp`);--> statement-breakpoint
+CREATE TABLE `__new_tags` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`user_id` integer DEFAULT 0 NOT NULL,
+	`name` text NOT NULL,
+	FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON UPDATE no action ON DELETE no action
+);
+--> statement-breakpoint
+INSERT INTO `__new_tags`("id", "user_id", "name") SELECT "id", "user_id", "name" FROM `tags`;--> statement-breakpoint
+DROP TABLE `tags`;--> statement-breakpoint
+ALTER TABLE `__new_tags` RENAME TO `tags`;--> statement-breakpoint
+CREATE UNIQUE INDEX `tags_name_user_unique` ON `tags` (`name`,`user_id`);

drizzle/meta/_journal.json

@@ -15,6 +15,13 @@
       "when": 1773016788899,
       "tag": "0001_strange_lord_hawal",
       "breakpoints": true
+    },
+    {
+      "idx": 2,
+      "version": "6",
+      "when": 1773150888301,
+      "tag": "0002_deep_black_widow",
+      "breakpoints": true
     }
   ]
 }