Implement spiral pattern for mass room creation

[Copilot]

Mass room creation currently uses sequential placement (left-to-right, top-to-bottom). This changes it to use a spiral pattern starting from center, matching AI/computer assistance behavior.

Changes

Data Structure

• Added spiral state to RoomSpace: forward_direction, turns_made, steps_to_take_before_turning, steps_remaining_before_turn
• Direction encoding: 0=North, 1=East, 2=South, 3=West with deltas {(0,-1), (1,0), (0,1), (-1,0)}

Algorithm

• initialize_spiral_state(): Positions at center with steps_remaining=0 to trigger immediate setup
• advance_spiral(): Decrements steps, rotates direction on turn, increments step count every 2 turns (odd turns), then moves
• Pattern: Center → 1E → 1S → 2W → 2N → 3E → 3S → 4W → 4N → ...

Modified Functions

• keeper_build_roomspace(): Initialize spiral from center instead of top-left
• keeper_sell_roomspace(): Initialize spiral from center instead of drag start
• keeper_update_roomspace(): Replace sequential traversal (4 directional switch cases) with single spiral loop

// Before: Sequential based on drag direction
case top_left_to_bottom_right:
    roomspace->buildx++;
    if (roomspace->buildx > roomspace->right) {
        roomspace->buildx = roomspace->left;
        roomspace->buildy++;
    }
    
// After: Unified spiral from center
advance_spiral(roomspace);  // Handles all directions via spiral state

The spiral algorithm matches the AI implementation in player_comptask.c exactly, using the same turn logic and step progression.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Change mass room creation pattern from sequential to spiral</issue_title>
<issue_description>Feature Request:
The current drag-to-create room tiles feature places tiles sequentially, which differs from how the computer AI/assistance mode creates rooms.

Current Behavior:
When dragging to mass create room tiles, they are placed in a sequential pattern (likely left-to-right, top-to-bottom or similar).

Requested Change:
Change the mass room creation logic to use a spiral pattern, similar to how enemy keepers and the computer assistance mode builds rooms. This would create rooms starting from the center and spiraling outward.

Benefits:

• Consistency with AI behavior
• More aesthetically pleasing room layouts
• Potentially better room functionality as rooms typically work better when built from the center outward
• More intuitive and matches player expectations based on how computer players build</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Change mass room creation pattern from sequential to spiral #9

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.