[AlexAndBear]

Description

• File name for single file shares: when an app opens the root of a share space (a single file shared with the user), the file context now uses the share name instead of the basename of the WebDAV path, which is the raw share id. This fixes the tab title and the app wrapper's page title.

Related Issue

• Fixes The tab title shows a raw id instead of the file name for a single file shared with you #3684

How Has This Been Tested?

• test environment: unit tests (Vitest)
• test case 1: the file context of a single file share (share space root) uses the share name as file name
• test case 2: a file inside a regular space still uses the basename of its path

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)