settings: add "tasks" button (advanced)

added a GET /tasks route to list tasks with a description (untranslated,
but this is mostly a dev feature anyway). Loaded in a modal by enabling
advanced settings and pressing the Tasks button at the top (where logs,
backups, restart are). Also added some icons in settings, and removed
some redundant "flex flex-row"s on buttons and reduced the spacing in
those with icons to gap-1.

router.go

@@ -244,6 +244,7 @@ func (app *appContext) loadRoutes(router *gin.Engine) {
 		api.POST(p+"/config", app.ModifyConfig)
 		api.POST(p+"/restart", app.restart)
 		api.GET(p+"/logs", app.GetLog)
+		api.GET(p+"/tasks", app.TaskList)
 		api.POST(p+"/tasks/housekeeping", app.TaskHousekeeping)
 		api.POST(p+"/tasks/users", app.TaskUserCleanup)
 		if app.config.Section("jellyseerr").Key("enabled").MustBool(false) {