feat: show search icon in header instead of input

+ fix: persistent updating text on update playlist modal
+ move router routes to a separate file
    + lazy import route components
+ remove loading: lazy from songcard
+ remove unused imports on navigation component

src/components/LeftSidebar/NP/SongCard.vue

@@ -13,7 +13,6 @@
           :src="imguri + track?.image"
           alt=""
           class="l-image rounded force-lm"
-          loading="lazy"
         />
         <div id="bitrate" v-if="track?.bitrate">
           {{ track.filetype }}• {{ track.bitrate }}