fix(desktop): make snapshot extension enable idempotent

[AKolenda]

What Changed

Treat enabling the GNOME snapshot extension as a successful no-op when GNOME already reports it as active. A focused regression test verifies that setup resolves successfully without sending a redundant EnableExtension call.

Why

A repeated or raced setup action currently turns the valid enabled state into a DesktopSnapShotSetupError. This makes the app report that it could not set up the GNOME extension even though capture is already ready.

Checklist

• This PR is small and focused
• I explained what changed and why

Verification

• vp test run apps/desktop/src/snapShot/GnomeCaptureSetup.test.ts
• vp lint apps/desktop/src/snapShot/GnomeCaptureSetup.ts apps/desktop/src/snapShot/GnomeCaptureSetup.test.ts
• vp fmt --check apps/desktop/src/snapShot/GnomeCaptureSetup.ts apps/desktop/src/snapShot/GnomeCaptureSetup.test.ts
• vp run --filter @t3tools/desktop typecheck

Model: GPT-5
Harness: Codex desktop app

Summary by CodeRabbit

• Bug Fixes
  • Fixed GNOME capture setup so enabling an already active capture extension completes successfully without triggering an unnecessary enable request.
• Tests
  • Added coverage for the already-enabled extension scenario.

[macroscopeapp]

Approvability

Verdict: Approved at a82f999

Macroscope's review found this PR approvable — This is a focused idempotency bug fix that avoids a redundant GNOME D-Bus enable call when the extension is already active, with a regression test covering the new behavior. Other setup actions and existing states are unchanged.

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[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 77bca8b and a82f999.

📒 Files selected for processing (2)

• apps/desktop/src/snapShot/GnomeCaptureSetup.test.ts
• apps/desktop/src/snapShot/GnomeCaptureSetup.ts

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📝 Walkthrough

Walkthrough

The GNOME capture setup now returns early when enable-extension targets an already-enabled extension. A test confirms successful completion without an EnableExtension D-Bus request.

Changes

GNOME capture enable behavior

Layer / File(s)	Summary
Enable guard and coverage apps/desktop/src/snapShot/GnomeCaptureSetup.ts, apps/desktop/src/snapShot/GnomeCaptureSetup.test.ts	perform("enable-extension") now succeeds when the extension state is enabled. The test verifies that EnableExtension is not called.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Suggested reviewers: bil0000

Merge Risk: ⚪ Minimal · up to a82f9

The enabled-extension path now completes without an unnecessary D-Bus request, and no concrete merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: making GNOME snapshot extension enabling idempotent.
Description check	✅ Passed	The description explains what changed, why it changed, the focused scope, and verification steps. The omitted UI checklist items are not applicable because this change does not modify the UI.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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