feat: A-frame tent + portal walk-through field + texture polish

- camping: replace cube tent with A-frame slope panels (tent_panel_l/r) +
  cardinal_direction permutations; vote-skip sleep that mixes
  player.isSleeping bed sleepers with tent occupants and respects the
  playersSleepingPercentage gamerule; new weathered-canvas texture.
- lobby: walk-through silverlabs:portal_field block (no collision,
  translucent swirl, cross-plane geo) auto-placed above each portal frame;
  invisible silverlabs:portal_label entity floats above each portal with
  the destination world name; transfer detection now scans down through
  the field to find the destination frame.
- postal: regenerate post_office and mailbox block textures so they fill
  the full block face (brick + POST plaque, full red panel with slot/latch
  /flag/rivets) instead of small sprites floating on transparent.
- dynamite + tow-boat: ship the addons (volumes wired into all four
  worlds; enabled_packs registers them into Mya's world).
- art: build-textures.py extended; build-art-catalog.py added to project.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

dynamite-addon/dynamite_BP/entities/thrown_banger.json

@@ -0,0 +1,47 @@
+{
+  "format_version": "1.21.0",
+  "minecraft:entity": {
+    "description": {
+      "identifier": "silverlabs:thrown_banger",
+      "is_spawnable": false,
+      "is_summonable": true,
+      "is_experimental": false
+    },
+    "components": {
+      "minecraft:collision_box": {
+        "width": 0.25,
+        "height": 0.25
+      },
+      "minecraft:physics": {},
+      "minecraft:pushable": {
+        "is_pushable": false,
+        "is_pushable_by_piston": false
+      },
+      "minecraft:projectile": {
+        "on_hit": {
+          "impact_damage": {
+            "damage": 2,
+            "knockback": true,
+            "destroy_on_hit": true,
+            "semi_random_diff_damage": false
+          },
+          "spawn_aoe_cloud": {
+            "radius": 1.5,
+            "duration": 0,
+            "particle": "minecraft:explosion_manual",
+            "affect_owner": false
+          },
+          "remove_on_hit": {}
+        },
+        "power": 1.4,
+        "gravity": 0.05,
+        "inertia": 0.99,
+        "liquid_inertia": 0.6,
+        "anchor": 1,
+        "offset": [0, -0.1, 0],
+        "should_bounce": false,
+        "hit_sound": "random.fuse"
+      }
+    }
+  }
+}