Change function description comments to tsdoc style (#35185)

1. change function comments to the minimal [tsdoc](https://tsdoc.org/)
style. This has the benefit of making editors show the doc string in
tooltips when the function is hovered:

<img width="521" height="110" alt="image"
src="https://github.com/user-attachments/assets/b966f4f1-8239-433a-a456-5bd5c05d69ef"
/>

2. disable eslint `multiline-comment-style` as it conflicts with tsdoc.

---------

Signed-off-by: silverwind <me@silverwind.io>

web_src/js/utils/color.ts

@@ -1,7 +1,7 @@
 import tinycolor from 'tinycolor2';
 import type {ColorInput} from 'tinycolor2';
 
-// Returns relative luminance for a SRGB color - https://en.wikipedia.org/wiki/Relative_luminance
+/** Returns relative luminance for a SRGB color - https://en.wikipedia.org/wiki/Relative_luminance */
 // Keep this in sync with modules/util/color.go
 function getRelativeLuminance(color: ColorInput): number {
   const {r, g, b} = tinycolor(color).toRgb();
@@ -12,8 +12,9 @@ function useLightText(backgroundColor: ColorInput): boolean {
   return getRelativeLuminance(backgroundColor) < 0.453;
 }
 
-// Given a background color, returns a black or white foreground color that the highest
-// contrast ratio. In the future, the APCA contrast function, or CSS `contrast-color` will be better.
+/** Given a background color, returns a black or white foreground color that the highest
+ *  contrast ratio. */
+// In the future, the APCA contrast function, or CSS `contrast-color` will be better.
 // https://github.com/color-js/color.js/blob/eb7b53f7a13bb716ec8b28c7a56f052cd599acd9/src/contrast/APCA.js#L42
 export function contrastColor(backgroundColor: ColorInput): string {
   return useLightText(backgroundColor) ? '#fff' : '#000';

web_src/js/utils/dom.ts

@@ -71,7 +71,7 @@ export function queryElemSiblings<T extends Element>(el: Element, selector = '*'
   }), fn);
 }
 
-// it works like jQuery.children: only the direct children are selected
+/** it works like jQuery.children: only the direct children are selected */
 export function queryElemChildren<T extends Element>(parent: Element | ParentNode, selector = '*', fn?: ElementsCallback<T>): ArrayLikeIterable<T> {
   if (isInFrontendUnitTest()) {
     // https://github.com/capricorn86/happy-dom/issues/1620 : ":scope" doesn't work
@@ -81,7 +81,7 @@ export function queryElemChildren<T extends Element>(parent: Element | ParentNod
   return applyElemsCallback<T>(parent.querySelectorAll(`:scope > ${selector}`), fn);
 }
 
-// it works like parent.querySelectorAll: all descendants are selected
+/** it works like parent.querySelectorAll: all descendants are selected */
 // in the future, all "queryElems(document, ...)" should be refactored to use a more specific parent if the targets are not for page-level components.
 export function queryElems<T extends HTMLElement>(parent: Element | ParentNode, selector: string, fn?: ElementsCallback<T>): ArrayLikeIterable<T> {
   return applyElemsCallback<T>(parent.querySelectorAll(selector), fn);
@@ -95,8 +95,8 @@ export function onDomReady(cb: () => Promisable<void>) {
   }
 }
 
-// checks whether an element is owned by the current document, and whether it is a document fragment or element node
-// if it is, it means it is a "normal" element managed by us, which can be modified safely.
+/** checks whether an element is owned by the current document, and whether it is a document fragment or element node
+ *  if it is, it means it is a "normal" element managed by us, which can be modified safely. */
 export function isDocumentFragmentOrElementNode(el: Node) {
   try {
     return el.ownerDocument === document && el.nodeType === Node.ELEMENT_NODE || el.nodeType === Node.DOCUMENT_FRAGMENT_NODE;
@@ -106,8 +106,8 @@ export function isDocumentFragmentOrElementNode(el: Node) {
   }
 }
 
-// autosize a textarea to fit content. Based on
-// https://github.com/github/textarea-autosize
+/** autosize a textarea to fit content. */
+// Based on https://github.com/github/textarea-autosize
 // ---------------------------------------------------------------------
 // Copyright (c) 2018 GitHub, Inc.
 //
@@ -246,8 +246,8 @@ export function onInputDebounce(fn: () => Promisable<any>) {
 
 type LoadableElement = HTMLEmbedElement | HTMLIFrameElement | HTMLImageElement | HTMLScriptElement | HTMLTrackElement;
 
-// Set the `src` attribute on an element and returns a promise that resolves once the element
-// has loaded or errored.
+/** Set the `src` attribute on an element and returns a promise that resolves once the element
+ *  has loaded or errored. */
 export function loadElem(el: LoadableElement, src: string) {
   return new Promise((resolve) => {
     el.addEventListener('load', () => resolve(true), {once: true});
@@ -286,7 +286,7 @@ export function isElemVisible(el: HTMLElement): boolean {
   return !el.classList.contains('tw-hidden') && (el.offsetWidth || el.offsetHeight || el.getClientRects().length) && el.style.display !== 'none';
 }
 
-// replace selected text in a textarea while preserving editor history, e.g. CTRL-Z works after this
+/** replace selected text in a textarea while preserving editor history, e.g. CTRL-Z works after this */
 export function replaceTextareaSelection(textarea: HTMLTextAreaElement, text: string) {
   const before = textarea.value.slice(0, textarea.selectionStart ?? undefined);
   const after = textarea.value.slice(textarea.selectionEnd ?? undefined);
@@ -368,7 +368,7 @@ export function addDelegatedEventListener<T extends HTMLElement, E extends Event
   }, options);
 }
 
-// Returns whether a click event is a left-click without any modifiers held
+/** Returns whether a click event is a left-click without any modifiers held */
 export function isPlainClick(e: MouseEvent) {
   return e.button === 0 && !e.ctrlKey && !e.metaKey && !e.altKey && !e.shiftKey;
 }

web_src/js/utils/image.ts

@@ -29,8 +29,8 @@ type ImageInfo = {
   dppx?: number,
 }
 
-// decode a image and try to obtain width and dppx. It will never throw but instead
-// return default values.
+/** decode a image and try to obtain width and dppx. It will never throw but instead
+ *  return default values. */
 export async function imageInfo(blob: Blob): Promise<ImageInfo> {
   let width = 0, dppx = 1; // dppx: 1 dot per pixel for non-HiDPI screens
 

web_src/js/utils/time.ts

@@ -65,8 +65,8 @@ export function fillEmptyStartDaysWithZeroes(startDays: number[], data: DayDataO
 
 let dateFormat: Intl.DateTimeFormat;
 
-// format a Date object to document's locale, but with 24h format from user's current locale because this
-// option is a personal preference of the user, not something that the document's locale should dictate.
+/** Format a Date object to document's locale, but with 24h format from user's current locale because this
+ *  option is a personal preference of the user, not something that the document's locale should dictate. */
 export function formatDatetime(date: Date | number): string {
   if (!dateFormat) {
     // TODO: replace `hour12` with `Intl.Locale.prototype.getHourCycles` once there is broad browser support

web_src/js/utils/url.ts

@@ -14,8 +14,8 @@ export function isUrl(url: string): boolean {
   }
 }
 
-// Convert an absolute or relative URL to an absolute URL with the current origin. It only
-// processes absolute HTTP/HTTPS URLs or relative URLs like '/xxx' or '//host/xxx'.
+/** Convert an absolute or relative URL to an absolute URL with the current origin. It only
+ *  processes absolute HTTP/HTTPS URLs or relative URLs like '/xxx' or '//host/xxx'. */
 export function toOriginUrl(urlStr: string) {
   try {
     if (urlStr.startsWith('http://') || urlStr.startsWith('https://') || urlStr.startsWith('/')) {