Avoid page reload when triggering actions in bookmark list (#506)

* Extract bookmark view contexts

* Implement basic partial updates for bookmark list and tag cloud

* Refactor confirm button JS into web component

* Refactor bulk edit JS into web component

* Refactor tag autocomplete JS into web component

* Refactor bookmark page JS into web component

* Refactor global shortcuts JS into web component

* Update tests

* Add E2E test for partial updates

* Add partial updates for archived bookmarks

* Add partial updates for shared bookmarks

* Cleanup helpers

* Improve naming in bulk edit

* Refactor shared components into behaviors

* Refactor bulk edit components into behaviors

* Refactor bookmark list components into behaviors

* Update tests

* Combine all scripts into bundle

* Fix E2E CI

bookmarks/frontend/util.js

@@ -0,0 +1,37 @@
+export function debounce(callback, delay = 250) {
+  let timeoutId;
+  return (...args) => {
+    clearTimeout(timeoutId);
+    timeoutId = setTimeout(() => {
+      timeoutId = null;
+      callback(...args);
+    }, delay);
+  };
+}
+
+export function clampText(text, maxChars = 30) {
+  if (!text || text.length <= 30) return text;
+
+  return text.substr(0, maxChars) + "...";
+}
+
+export function getCurrentWordBounds(input) {
+  const text = input.value;
+  const end = input.selectionStart;
+  let start = end;
+
+  let currentChar = text.charAt(start - 1);
+
+  while (currentChar && currentChar !== " " && start > 0) {
+    start--;
+    currentChar = text.charAt(start - 1);
+  }
+
+  return { start, end };
+}
+
+export function getCurrentWord(input) {
+  const bounds = getCurrentWordBounds(input);
+
+  return input.value.substring(bounds.start, bounds.end);
+}