[AlexAndBear]

Description

• Separate search tasks: the search preview and the results list shared one restartable search task, so a preview search (e.g. clicking into the search field) cancelled the running results search and the results page kept spinning. The files app now creates one task for the preview and one for the list.
• No List.vue change: with separate tasks only a newer list search can cancel a list search, and that newer search resets the loading state itself.

Related Issue

• Fixes The search results page spins forever when the search preview runs #3867

How Has This Been Tested?

• test environment: unit tests (Vitest), browser tests (Playwright) against a local OpenCloud
• test case 1: unit: a preview search started while a list search is running no longer cancels the list search (fails without the fix with a 'cancel' rejection)
• test case 2: browser: with search requests delayed by 3 s, pressing Enter right away or clicking into the search field while results load showed an endless spinner on main and shows the results or 'No results found' with the fix, desktop and mobile
• test case 3: browser: search preview while typing, results page filters and location chip, a second search from the results page, back and forward between searches, current folder scope

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)

[tammi-23]

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