Projects (#192)

* Add file save UI and drafts project

* Fix build

* Create SearchList component as abstraction

* Add project page and file tree view

* Create Locale context

* Create Theme context

* Create Version context

* Create Title context

* Create Project context

* Store current file in project context

* Fix issues when renaming file and implement deleting

* Style improvements

* Make all project strings translatable

* Fix z-index

src/app/contexts/Version.tsx

@@ -0,0 +1,54 @@
+import type { ComponentChildren } from 'preact'
+import { createContext } from 'preact'
+import { getCurrentUrl } from 'preact-router'
+import { useCallback, useContext, useEffect, useState } from 'preact/hooks'
+import { Analytics } from '../Analytics'
+import type { VersionId } from '../services'
+import { VersionIds } from '../services'
+import { Store } from '../Store'
+import { getSearchParams, setSeachParams } from '../Utils'
+
+const VERSION_PARAM = 'version'
+
+interface Version {
+	version: VersionId,
+	changeVersion: (version: VersionId) => unknown,
+}
+const Version = createContext<Version>({
+	version: '1.18',
+	changeVersion: () => {},
+})
+
+export function useVersion() {
+	return useContext(Version)
+}
+
+export function VersionProvider({ children }: { children: ComponentChildren }) {
+	const [version, setVersion] = useState<VersionId>(Store.getVersion())
+
+	const searchParams = getSearchParams(getCurrentUrl())
+	const targetVersion = searchParams.get(VERSION_PARAM)
+	useEffect(() => {
+		if (VersionIds.includes(targetVersion as VersionId) && version !== targetVersion) {
+			setVersion(targetVersion as VersionId)
+		}
+	}, [version, targetVersion])
+
+	const changeVersion = useCallback((version: VersionId) => {
+		if (getSearchParams(getCurrentUrl()).has(VERSION_PARAM)) {
+			setSeachParams({ version })
+		}
+		Analytics.setVersion(version)
+		Store.setVersion(version)
+		setVersion(version)
+	}, [])
+
+	const value: Version = {
+		version,
+		changeVersion,
+	}
+
+	return <Version.Provider value={value}>
+		{children}
+	</Version.Provider>
+}