Fix Linux tray icon scaling

[krisnaparahita]

What does this PR do?

Scales the tray icon to 24x24 with LANCZOS resampling on Linux before creating the QIcon, while leaving behavior on other platforms unchanged.

This intentionally keeps the fix narrowly scoped to icon rendering and does not change the click-to-open-menu behavior.

Related Issues

Fixes: #528

Contributor License Agreement

I, @krisnaparahita, confirm that I have read and agree to the Contributors License Agreement.

Checklists

• Tests have been run locally and passed (app/desktop/test_desktop.py: 20 tests; Ruff)
• Two unit tests were added covering Linux scaling and unchanged Windows behavior
• No work was done in /lib

[coderabbitai]

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• app/desktop/test_desktop.py

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Walkthrough

run_tray now scales the tray icon to 24x24 with LANCZOS on Linux. Tests verify Linux scaling and unchanged Windows behavior.

Changes

Linux tray icon behavior

Layer / File(s)	Summary
Icon scaling and validation app/desktop/desktop.py, app/desktop/test_desktop.py	run_tray resizes the icon to 24x24 on Linux with LANCZOS. Tests verify the resized image reaches KilnTray and that Windows skips resizing.

Priority: ➖ Normal

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

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to ea8c0

Linux tray icons are scaled to 24×24 while Windows behavior remains unchanged; no concrete merge-blocking risk is identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	Issue #528 has two coding objectives. The PR implements the icon-rendering objective in run_tray: Linux uses resize((24, 24), Image.Resampling.LANCZOS), and tests verify Linux scaling and unchange…	Implement Linux tray click-to-open-menu behavior in run_tray or the relevant tray integration. Add an automated test that verifies the Linux tray click opens the menu or invokes the expected default menu action.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description follows the repository template. It explains the change, links issue #528, includes the CLA confirmation, and records completed checks and tests. It also clearly states that click-to-o…
Title check	✅ Passed	The title is concise and accurately describes the main change: Linux tray icon scaling.
Out of Scope Changes check	✅ Passed	The changed source code and tests are limited to Linux tray icon scaling and platform-specific scaling coverage. These changes directly support the icon-rendering objective in issue #528. No unrelated…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 2 files.

Full details: Linked Issues check

Explanation

Issue #528 has two coding objectives. The PR implements the icon-rendering objective in run_tray: Linux uses resize((24, 24), Image.Resampling.LANCZOS), and tests verify Linux scaling and unchanged Windows behavior. The PR does not implement the second objective. make_open_studio_default remains enabled only for Windows, so Linux click-to-open-menu behavior remains unchanged.

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_{A rabbit watched the tray icon glow
Linux shaped it just so
Twenty-four pixels stood in line
LANCZOS made the edges shine
Windows kept its size in tow}

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Actionable comments posted: 1

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Inline comments:
In `@app/desktop/test_desktop.py`:
- Around line 249-251: Update the test around mock_image.resize to assert the
complete Linux scaling contract: verify resize receives (24, 24) together with
Image.Resampling.LANCZOS, and verify the resized image result is passed to
KilnTray. Preserve the existing call-count assertion.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Advanced

Run ID: 5d584080-b9f8-448b-9b29-6a8ef25b9ea9

📥 Commits

Reviewing files that changed from the base of the PR and between 9893493 and 6224871.

📒 Files selected for processing (2)

• app/desktop/desktop.py
• app/desktop/test_desktop.py

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[scosman]

can you send a screenshot of the fix working?