feat(combat): Integrate chair kicking with punch mechanic

Update chair interaction to use the punch system instead of direct kicking:

**Changes to interactions.js:**
- Modified swivel chair interaction to trigger player punch instead of
  directly applying kick velocity
- Simplified chair interaction handler to just call playerCombat.punch()

**Changes to player-combat.js:**
- Extended checkForHits() to detect chairs in punch range and direction
- Added kickChair() method that applies the same velocity calculation:
  - Calculates direction from player to chair
  - Applies 1200 px/s kick force in that direction
  - Triggers spin direction calculation for visual rotation
  - Adds visual feedback (flash chair, light screen shake)
- Chairs now respond to punch AOE damage like hostile NPCs

Now clicking a chair or pressing 'E' near it triggers a punch, and if the
chair is in punch range and facing direction, it gets kicked with the
original velocity physics. Multiple chairs can be kicked with one punch.

js/systems/interactions.js

@@ -453,35 +453,13 @@ export function handleObjectInteraction(sprite) {
         });
     }
     
-    // Handle swivel chair interaction - send it flying!
+    // Handle swivel chair interaction - trigger punch to kick it!
     if (sprite.isSwivelChair && sprite.body) {
         const player = window.player;
-        if (player) {
-            // Calculate direction from player to chair
-            const dx = sprite.x - player.x;
-            const dy = sprite.y - player.y;
-            const distance = Math.sqrt(dx * dx + dy * dy);
-            
-            if (distance > 0) {
-                // Normalize the direction vector
-                const dirX = dx / distance;
-                const dirY = dy / distance;
-                
-                // Apply a strong kick velocity
-                const kickForce = 1200; // Pixels per second
-                sprite.body.setVelocity(dirX * kickForce, dirY * kickForce);
-                
-                // Trigger spin direction calculation for visual rotation
-                if (window.calculateChairSpinDirection) {
-                    window.calculateChairSpinDirection(player, sprite);
-                }
-                
-                // Show feedback message
-                console.log('SWIVEL CHAIR KICKED', { 
-                    chairName: sprite.name,
-                    velocity: { x: dirX * kickForce, y: dirY * kickForce }
-                });
-            }
+        if (player && window.playerCombat) {
+            // Trigger punch instead of directly kicking the chair
+            // The punch system will detect the chair and apply kick velocity
+            window.playerCombat.punch();
         }
         return;
     }

js/systems/player-combat.js

@@ -130,9 +130,41 @@ export class PlayerCombat {
       hitCount++;
     });
 
+    // Check for chairs in range and direction
+    let chairsHit = 0;
+    if (window.chairs && window.chairs.length > 0) {
+      window.chairs.forEach(chair => {
+        // Only kick swivel chairs with physics bodies
+        if (!chair.isSwivelChair || !chair.body) {
+          return;
+        }
+
+        const chairX = chair.x;
+        const chairY = chair.y;
+        const distance = Phaser.Math.Distance.Between(playerX, playerY, chairX, chairY);
+
+        if (distance > punchRange) {
+          return; // Too far
+        }
+
+        // Check if chair is in the facing direction
+        if (!this.isInDirection(playerX, playerY, chairX, chairY, direction)) {
+          return; // Not in facing direction
+        }
+
+        // Hit landed! Kick the chair
+        this.kickChair(chair);
+        chairsHit++;
+      });
+    }
+
     if (hitCount > 0) {
       console.log(`Player punch hit ${hitCount} NPC(s)`);
-    } else {
+    }
+    if (chairsHit > 0) {
+      console.log(`Player punch hit ${chairsHit} chair(s)`);
+    }
+    if (hitCount === 0 && chairsHit === 0) {
       console.log('Player punch missed');
     }
   }
@@ -192,4 +224,49 @@ export class PlayerCombat {
 
     console.log(`Dealt ${damage} damage to ${npc.id}`);
   }
+
+  /**
+   * Apply kick velocity to chair
+   * @param {Phaser.GameObjects.Sprite} chair - Chair sprite
+   */
+  kickChair(chair) {
+    if (!chair || !chair.body || !window.player) {
+      return;
+    }
+
+    // Calculate direction from player to chair
+    const dx = chair.x - window.player.x;
+    const dy = chair.y - window.player.y;
+    const distance = Math.sqrt(dx * dx + dy * dy);
+
+    if (distance > 0) {
+      // Normalize the direction vector
+      const dirX = dx / distance;
+      const dirY = dy / distance;
+
+      // Apply a strong kick velocity
+      const kickForce = 1200; // Pixels per second
+      chair.body.setVelocity(dirX * kickForce, dirY * kickForce);
+
+      // Trigger spin direction calculation for visual rotation
+      if (window.calculateChairSpinDirection) {
+        window.calculateChairSpinDirection(window.player, chair);
+      }
+
+      // Visual feedback - flash the chair
+      if (window.spriteEffects) {
+        window.spriteEffects.flashHit(chair);
+      }
+
+      // Light screen shake
+      if (window.screenEffects) {
+        window.screenEffects.shake(2, 150);
+      }
+
+      console.log('CHAIR KICKED', {
+        chairName: chair.name,
+        velocity: { x: dirX * kickForce, y: dirY * kickForce }
+      });
+    }
+  }
 }