Invalid character (exclamation mark) in Project title

[IvaKuklica]

Description
When creating a project whose name ends with an exclamation mark (for example MyProject!), the project is created locally but is not uploaded on the server. The user finishes the creation flow but the project never appears in the server project list.

Environment
Staging

Application (+ app version, build, operating system)
App version: 2026.1.1 (build 776151)
Device/OS: Samsung Galaxy A53 5G, / Android 15
App version: 2026.1.1 (build 870211)
Device/OS: IPone 14.5 / iOS 26.1

Steps to reproduce

1. Open the app and create a new project.
2. Enter a project name that ends with an exclamation mark (e.g., MyProject!).
3. Upload the project to the server.
4. Observe the server project list.

Actual results

• Project is created locally but does not appear on the server.
• No clear error or warning is shown to the user during creation.

Expected results

• The application should prevent creation of a project whose name contains invalid characters (!).
• The project should not be created locally when the name is invalid.
• The application should display a clear warning message to the user indicating the project name contains invalid characters.

Screenshots

Screen_Recording_20260303_153410.mp4

[Withalion]

Server uses these checks and we should synchronize mobile to use them too:

• project name can't be support helpdesk merginmaps lutraconsulting mergin lutra input admin sales
• project name can't start with any whitespace (space, tab, line break) and dot
• project name can consist of any alphanumeric characters, any whitespace, _, -, .
• project name can't be longer than 255 characters
• some more checks are done by pathvalidate library