feature: add per-application opacity controls

[amanCodex148]

Summary

Adds per-application active opacity controls to the Hyprland settings page.

Features

• Search installed applications
• Enable or disable opacity override per application
• Configure active opacity from 10% to 100%
• Persist application opacity rules in the shell configuration
• Generate Hyprland window_rule entries automatically
• Synchronize changes through the existing HyprlandConfig service
• Load generated application opacity rules through shellOverrides
• Validate and clamp invalid opacity values
• Generate shell override files atomically
• Avoid unnecessary Hyprland reloads when configuration output is unchanged
• Handle generator failures with a non-zero exit status

Screenshot

Validation

• Tested on Hyprland with Firefox
• 50% active opacity generated correctly
• Configuration persisted to config.json
• Changing opacity regenerated the Lua rule
• Changing inactive opacity regenerated application rules
• Disabling the override removed the generated rule
• Invalid config handling returns a non-zero exit status
• Re-running without changes does not reload Hyprland
• git diff --check passed
• Python syntax validation passed

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