Fix v0.5.4 desktop size gate

[dekanbro]

Extract the existing initial-window helpers from lib.rs into a focused module. This is behavior-preserving and brings lib.rs from 1,010 to 945 lines so the desktop file-size ratchet passes after the v0.5.4 merge.

Validation:

• cargo fmt --manifest-path desktop/src-tauri/Cargo.toml -- --check
• pnpm --dir desktop check
• pnpm --dir desktop typecheck
• git diff --check

Summary by CodeRabbit

• Bug Fixes
  • Improved macOS app startup so the initial window appears smoothly after rendering is ready.
  • Prevented window flickering and visual artifacts during launch.
  • Added geometry stabilization to ensure the window opens at the correct size and position.
  • Improved startup resilience by handling window errors without crashing.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 95a39c39-a065-4dc7-bd16-72d337e1acd1

📥 Commits

Reviewing files that changed from the base of the PR and between 52edde4 and 9704371.

📒 Files selected for processing (2)

• desktop/src-tauri/src/initial_window.rs
• desktop/src-tauri/src/lib.rs

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📝 Walkthrough

Walkthrough

The change moves initial-window behavior into a dedicated module. It adds macOS backing-color control, render-readiness signaling, window reveal and focus handling, and geometry stabilization polling with timeout logging.

Changes

Initial Window Handling

Layer / File(s)	Summary
Initial-window reveal and stabilization desktop/src-tauri/src/initial_window.rs	Adds the render-ready event constant, window reveal and focus helper, macOS backing-color helpers, and geometry polling with stability and timeout conditions.
Initial-window module integration desktop/src-tauri/src/lib.rs	Registers the private initial_window module and imports its functionality.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Suggested reviewers: tlongwell-block, wpfleger96

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/v0.5.4-desktop-size

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