[AlexAndBear]

Description

The "Resource not found" page for a project space you can't access now also says so in the browser tab, instead of keeping the title of the previous page.

Related Issue

• Fixes Tab title isn't updated on the not found page for inaccessible project spaces #4321

How Has This Been Tested?

• test environment: unit tests (Vitest), browser tests (Playwright) against a local OpenCloud
• test case 1: unit: the not found state publishes the title, redirects don't publish one
• test case 2: browser: direct load, Personal and Back/Forward, Spaces Overview and Back, unknown trash and sub-path URLs on desktop and Pixel 7; personal/home, /files/spaces, shares and valid project spaces keep their titles

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)