fix: load indirect shares in editors - #3313

Description

Editor routes load files without the folder loader, so ancestor metadata stays empty. The sharing sidebar then has no ancestor IDs from which to load indirect shares.

Load ancestor metadata when the share loader runs inside an editor. The regression test covers both search and editor routes.

Related Issue

• Fixes Editor doesn't show indirect shares in sidebar #3298

How Has This Been Tested?

• test environment: Node 24.20.0, pnpm 11.25.0
• test case 1: FileSideBar unit suite (19 passed)
• test case 2: full unit suite (3,916 passed, 6 skipped, 11 todo)
• test case 3: type checks, lint, formatting, and production build

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)