Add conditional boss battle teams (variant teams by condition)

Wire up the existing condition_label column on boss_pokemon to support
variant teams throughout the UI. Boss battles can now have multiple team
configurations based on conditions (e.g., starter choice in Gen 1).

- Add condition_label to BossPokemonInput schema (frontend + backend bulk import)
- Rewrite BossTeamEditor with variant tabs (Default + named conditions)
- Add variant pill selector to BossDefeatModal team preview
- Add BossTeamPreview component to RunEncounters boss cards
- Fix MissingGreenlet error in set_boss_team via session.expunge_all()
- Fix PokemonSelector state bleed between tabs via composite React key
- Add Alembic migration for condition_label column

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/app/alembic/versions/b7c8d9e0f1a2_add_condition_label_to_boss_pokemon.py

@@ -0,0 +1,26 @@
+"""add condition_label to boss_pokemon
+
+Revision ID: b7c8d9e0f1a2
+Revises: a6b7c8d9e0f1
+Create Date: 2026-02-08 22:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'b7c8d9e0f1a2'
+down_revision: Union[str, Sequence[str], None] = 'a6b7c8d9e0f1'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('boss_pokemon', sa.Column('condition_label', sa.String(100), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('boss_pokemon', 'condition_label')

backend/src/app/api/bosses.py

@@ -228,11 +228,17 @@ async def set_boss_team(
             pokemon_id=item.pokemon_id,
             level=item.level,
             order=item.order,
+            condition_label=item.condition_label,
         )
         session.add(bp)
 
     await session.commit()
 
+    # Clear identity map so selectinload fetches everything fresh
+    # (expired Pokemon from deleted BossPokemon would otherwise cause
+    # MissingGreenlet errors during response serialization)
+    session.expunge_all()
+
     # Re-fetch with eager loading
     result = await session.execute(
         select(BossBattle)

backend/src/app/api/export.py

@@ -154,6 +154,7 @@ async def export_game_bosses(
                         "pokemon_name": bp.pokemon.name,
                         "level": bp.level,
                         "order": bp.order,
+                        **({"condition_label": bp.condition_label} if bp.condition_label else {}),
                     }
                     for bp in sorted(b.pokemon, key=lambda p: p.order)
                 ],

backend/src/app/models/boss_pokemon.py

@@ -1,4 +1,4 @@
-from sqlalchemy import ForeignKey, SmallInteger
+from sqlalchemy import ForeignKey, SmallInteger, String
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.core.database import Base
@@ -14,6 +14,7 @@ class BossPokemon(Base):
     pokemon_id: Mapped[int] = mapped_column(ForeignKey("pokemon.id"), index=True)
     level: Mapped[int] = mapped_column(SmallInteger)
     order: Mapped[int] = mapped_column(SmallInteger)
+    condition_label: Mapped[str | None] = mapped_column(String(100))
 
     boss_battle: Mapped["BossBattle"] = relationship(back_populates="pokemon")
     pokemon: Mapped["Pokemon"] = relationship()

backend/src/app/schemas/boss.py

@@ -9,6 +9,7 @@ class BossPokemonResponse(CamelModel):
     pokemon_id: int
     level: int
     order: int
+    condition_label: str | None
     pokemon: PokemonResponse
 
 
@@ -73,6 +74,7 @@ class BossPokemonInput(CamelModel):
     pokemon_id: int
     level: int
     order: int
+    condition_label: str | None = None
 
 
 class BossResultCreate(CamelModel):

backend/src/app/schemas/pokemon.py

@@ -200,6 +200,7 @@ class BulkBossPokemonItem(BaseModel):
     pokeapi_id: int
     level: int
     order: int
+    condition_label: str | None = None
 
 
 class BulkBossItem(BaseModel):

backend/src/app/seeds/loader.py

@@ -270,6 +270,7 @@ async def upsert_bosses(
                 pokemon_id=pokemon_id,
                 level=bp["level"],
                 order=bp["order"],
+                condition_label=bp.get("condition_label"),
             ))
 
         count += 1