Configurable split ratio for half window actions

[ispivak]

Summary

• Adds configurable split ratios for the Left/Right Half and Top/Bottom Half window actions, replacing the hardcoded 50/50 split
• Left and right halves are linked (e.g. 60% left = 40% right); same for top and bottom
• The drag-to-snap footprint preview also reflects the configured ratio
• Settings persist across sessions and are included in JSON config import/export

Configuration

Available in Preferences → General → ⋯ (Extra Settings) under "Half Split Ratios", or via terminal:

# Set left half to 60% width (right half will be 40%)
defaults write com.knollsoft.Rectangle horizontalSplitRatio -float 60

# Set top half to 60% height (bottom half will be 40%)
defaults write com.knollsoft.Rectangle verticalSplitRatio -float 60

Default value for both is 50 (50/50 split), so existing behavior is preserved for users who don't change it.

Test plan

• Set Horizontal split to 60 → Left Half shortcut positions window at 60% width from left
• Set Horizontal split to 60 → Right Half shortcut positions window at 40% width from right
• Drag window to left/right screen edge → snap footprint preview reflects the 60/40 ratio
• Set Vertical split to 70 → Top Half shortcut positions window at 70% height from top
• Set Vertical split to 70 → Bottom Half shortcut positions window at 30% height from bottom
• Export config to JSON → horizontalSplitRatio and verticalSplitRatio keys are present
• Leave both at 50 (default) → behavior identical to before this change

🤖 Generated with Claude Code

[rxhanson]

Thanks!

• Let's center align Half Split Ratios and right align the lines with fields, so that they are aligned with the other fields in this popover.
• Let's remove the Claude.md. Although it looks fine, it can potentially convey an endorsement of Claude by Rectangle, and I'd prefer it stay agnostic.
• Let's remove the change to TerminalCommands.md, as this is primarily for configurations that are not in the UI at this time.

[ispivak]

Done, everything should be aligned to the existing pattern. Removed claude.md from source and reverted command line changes. Thanks!