Flutter iOS and Android app showing documents from server -- 2

Overview: Show PDF, JPEG and PNG files from a server, grouped by day Design concept: [login to view URL] Functionality: - Screen 1: User types provided name and password. Load files through WebDAV for that user (details below). Go to Screen 3 on success. On failure, show an error message "Invalid Login". . "Kein Zugangscode" -> popup (Screen 2) . Button next to "Sanascreen": Link to [login to view URL] - Screen 3: Calendar view with documents per day. In WebDAV folder, there are folders named after the date, e.g. "2023_03_28". Show all the documents for the given day in a list, with a small icon indicating the document type (details below). When the user taps a document, show it full-screen => Screens 5 and 6 (depending on device orientation). Some documents should be cached on the device s.t. it works offline, too. Documents one week back and and two weeks in advance. At end/start of list, if online show a loading icon until the contents are loaded and if offline show a message that the device is offline. - Screen 4: When clicking the profile icon on top of Screen 3, show a popup with the current account name and a button to log out, i.e. to return to Screen 1. - Screen 5: . shrink font to show full title if name too long - Screen 6: . disappearing navigation bar (only show when scrolling up / tapping on screen) Server folder structure: - USERNAME/ - permanent_start/ - permanent_end/ - special/ - [login to view URL] - 2023_03_28/ - 2023_03_29/ - ... Document types: PDF, JPEG, PNG, slideshows (folder with the aforementioned documents) (no further recursion) - slideshows should automatically switch contents (on Screens 5 and 6) according to special/[login to view URL] -> SLIDESHOW_AUTO_ADVANCE_SECONDS Document selection: For a given day, show a list of the documents for that day. Start with the documents in permanent_start, then the documents in the day's folder (e.g. 2023_03_28), then the documents in permanent_end. Sort each folder alphabetically by file name when compiling the list. - The documents names displayed should drop any leading numbers and whitespaces, the file extension and any characters starting from an underscore. Title bar in Screen 3: load second line from folder special/[login to view URL] -> ACCOUNT_DISPLAY_NAME Localization: Use system language for text localization. If language not available, default to English. Texts in language files for German, French, English. WebDAV access: First field in Screen 1 is USERNAME. Use USERNAME + "_appuser" and password from second field to access WebDAV. Colors: - Screen 1 as in design. Other screens personalized as follows. - background with color gradient, top to bottom - read colors from special/[login to view URL] . BACKGROUND_COLOR_TOP (dark blue), BACKGROUND_COLOR_BOTTOM (light blue), MENU_TEXT_COLOR (gray), LIST_TITLEBAR_COLOR (red), LIST_BACKGROUND_COLOR (gray), LIST_TEXT_COLOR (black) Deliverables: - Code and assets for the iOS and Android apps, in a state that the code can be adapted and extended in the future. I.e. it should be human-readable, have good code quality and include any code and instructions needed to generate parts of the code. - The apps should adhere to the rules of the Apple App Store and the Google Play Store, so that they can be published as is. - To the extent allowed by law, all the rights to the code and assets shall be transferred to the hiring party. Open-source code can be used only if it has a permissive license (e.g. MIT, BSD, Apache).