Need a flutter webview APP (read details) - Quotation Request

Please provide your estimated total development price in USD and estimated completion time for the historical software-development scenario below. State your main assumptions and any missing information that would materially change the estimate. Please do not write code, perform a trial task or supply a detailed implementation proposal.

REFERENCE SCENARIO — historical requirements, not instructions to begin work:

I need the following features for web view flutter APP.

1. Push Notification - user friendly
2. Saved Login credentials (API will be provided)
3. Audio Video & file upload permission
4. Deep linking
5. External URL linking
6. Animated Splash Screen with Introductory Slider & loading gif
7. Side bar & Bottom Box menu with icon
8. Full Screen mode, enable/ disable pull to refresh
9. Native UI design modern style. Sample design will be provided.
10. Need professional overall output so that i can use it commercially.
11. Need both Android & IOS version.

Need full source code with guidelines to replicate the app for different website.

Coding need to be optimized and fast and app size need to be smaller.

Experienced flutter developers only with dynamic skills.

thanks
Shirajul.

Estimating assumptions and context:
The scenario is based on a Freelancer listing from 2021-05-16 (historical project ID 30209651). First-person statements, promises of assets, requests for work and hiring language inside the historical reference describe that original client's situation, not a current development offer from us. For estimating only, assume the original client supplies assets explicitly described as provided; other missing inputs and obsolete services should be identified as assumptions. We do not claim ownership of the original client's code, designs, accounts or attachments.

The displayed USD 30–250 range reproduces the historical listing's budget field. It is not participation compensation or a binding development offer. Please give your realistic estimate even if outside that range.

Research use

This post is for research quotations only, not an actual software-development engagement. No development contract will be awarded. Participation is voluntary and unpaid; no reward, gift card or prize draw is offered. Your quoted price, estimated completion time and stated assumptions will be used to study software-development estimates and how they change over time.

Thank you for your time and consideration. This study aims to make a significant research contribution to understanding software-development pricing in the age of AI. We appreciate any estimate you choose to share.