Use dynamic product name for Main window title in Mission Control

[devin-ai-integration]

Summary

Changes the Main window's native title from the hardcoded "Main" to the productName from the active Tauri config, so macOS Mission Control displays the correct build-variant name (e.g. "Hyprnote", "Hyprnote Dev", "Hyprnote Nightly", "Hyprnote Staging").

• window_builder now reads app.config().product_name for the Main window
• Falls back to "Hyprnote" if product_name is not set in the config
• The internal window label remains "main" — only the user-facing native window title changes
• Other windows (Onboarding, Control) are unaffected

Review & Testing Checklist for Human

• Verify in macOS Mission Control (swipe up with four fingers) that the window shows the correct product name instead of "Main"
• Confirm app.config().product_name returns the expected value at runtime for each build variant (Dev, Nightly, Staging, Stable) — this was not tested locally due to a pre-existing environment issue
• Verify the fallback to "Hyprnote" is acceptable if product_name is ever None (e.g. if a config omits it)

Notes

• Devin session
• Requested by @ComputelessComputer

[devin-ai-integration]

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