fix(editor): use manual input prompt instead of window.prompt

Resolves https://kolaente.dev/vikunja/desktop/issues/184

src/helpers/inputPrompt.ts

@@ -0,0 +1,39 @@
+import {createRandomID} from '@/helpers/randomId'
+import tippy from 'tippy.js'
+import {nextTick} from 'vue'
+import {eventToHotkeyString} from '@github/hotkey'
+
+export default function inputPrompt(pos: ClientRect, oldValue: string = ''): Promise<string> {
+	return new Promise((resolve) => {
+		const id = 'link-input-' + createRandomID()
+
+		const linkPopup = tippy('body', {
+			getReferenceClientRect: () => pos,
+			appendTo: () => document.body,
+			content: `<div><input class="input" placeholder="URL" id="${id}" value="${oldValue}"/></div>`,
+			showOnCreate: true,
+			interactive: true,
+			trigger: 'manual',
+			placement: 'top-start',
+			allowHTML: true,
+		})
+
+		linkPopup[0].show()
+
+		nextTick(() => document.getElementById(id)?.focus())
+
+		document.getElementById(id)?.addEventListener('keydown', event => {
+			const hotkeyString = eventToHotkeyString(event)
+			if (hotkeyString !== 'Enter') {
+				return
+			}
+
+			const url = event.target.value
+
+			resolve(url)
+
+			linkPopup[0].hide()
+		})
+
+	})
+}