refactor: move some test state to solid signals (@miodec)

[Miodec]

No description provided.

[Copilot]

Pull request overview

Refactors frontend test runtime state by moving “invalid test” + “incomplete/restart tracking” + “last result” out of test-stats module globals into Solid signals in states/test, and updates test flow code to use the new signal accessors/setters.

Changes:

• Add Solid signals + helper setters in frontend/src/ts/states/test.ts for invalid flag, last result, restart/incomplete tracking.
• Update test-logic to read/write that state via signals (including reset points on restart/finish).
• Update UI consumers (result.ts, pages/test.ts, test-stats.ts) to use the new state.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
frontend/src/ts/test/test-stats.ts	Removes module-global lastResult/invalid/incomplete* state; getStats() now pulls last result from states/test.
frontend/src/ts/test/test-logic.ts	Switches restart/incomplete/invalid/lastResult handling to states/test signals.
frontend/src/ts/test/result.ts	Reads invalid-state via isTestInvalid() signal instead of TestStats.invalid.
frontend/src/ts/states/test.ts	Introduces new signals for test invalid flag, last result, restart/incomplete tracking.
frontend/src/ts/pages/test.ts	Resets incomplete/restart signal state on beforeShow instead of TestStats.resetIncomplete().

[github-actions]

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