* update utils.ts: add a tool function to detect inactive periods * update Controller.svelte: add a fixed div element as an indicator * update Controller.svelte: add one blank space at the end * update Controller.svelte: add a variable inactivePeriods and use util function to get inactive periods * update Controller.svelte: add width property for inactive activity indicators * update Controller.svelte: combine calculation value with indicator UI * update utils.ts: fix error https://github.com/HurricaHjz/rrweb_2120_ga_3/pull/5#discussion_r1008677230 and add comments update Controller.svelte: apply Zihan's suggestion https://github.com/HurricaHjz/rrweb_2120_ga_3/pull/5#discussion_r1008678403 * update Controller.svelte: make the color of indicator customizable update index.d.ts: add type definition for the color option Co-authored-by: u7149141 <fengyun5264@outlook.com> Co-authored-by: Jerry Zhang <u7305891@anu.edu.au> Co-authored-by: fengyun5264 <115444501+fengyun5264@users.noreply.github.com> Co-authored-by: Zihan Meng <u7354208@anu.edu.au> Co-authored-by: HurricaHjz <105645379+HurricaHjz@users.noreply.github.com> Co-authored-by: u6924169 <u6924169@anu.edu.au> Co-authored-by: Majia0712 <55265314+MengZihan712@users.noreply.github.com>