Email confirmation, change email/password, show/hide passwords

- Sign-up emails a confirmation link (24h); unconfirmed accounts see a
  banner on the web with "send it again", and status in Settings.
- Change email (needs the password): the new address gets a confirmation
  link and only replaces the old one once clicked; the old address gets a
  heads-up with a reset-password link. Pending changes can be cancelled.
- Change password (needs the current one): signs out other sessions.
- Password fields have Show/Hide on web and mobile.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8

apps/api/drizzle/0012_email_verification.sql

@@ -0,0 +1,12 @@
+CREATE TABLE "email_verifications" (
+	"id" text PRIMARY KEY NOT NULL,
+	"user_id" uuid NOT NULL,
+	"email" varchar(320) NOT NULL,
+	"expires_at" timestamp with time zone NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "users" ADD COLUMN "email_verified_at" timestamp with time zone;--> statement-breakpoint
+ALTER TABLE "users" ADD COLUMN "pending_email" varchar(320);--> statement-breakpoint
+ALTER TABLE "email_verifications" ADD CONSTRAINT "email_verifications_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "email_verifications_user_idx" ON "email_verifications" USING btree ("user_id");