Add pokemon status management with death tracking

Implement status change workflow (alive → dead) with confirmation modal,
death cause recording, and visual status indicators on pokemon cards.
Includes backend migration for death_cause field and graveyard view
on the run dashboard.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/app/alembic/versions/a1b2c3d4e5f6_add_death_cause_to_encounters.py

@@ -0,0 +1,26 @@
+"""add death_cause to encounters
+
+Revision ID: a1b2c3d4e5f6
+Revises: 9afcbafe9888
+Create Date: 2026-02-05 17:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'a1b2c3d4e5f6'
+down_revision: Union[str, Sequence[str], None] = '9afcbafe9888'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('encounters', sa.Column('death_cause', sa.String(100), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('encounters', 'death_cause')

backend/src/app/models/encounter.py

@@ -17,6 +17,7 @@ class Encounter(Base):
     status: Mapped[str] = mapped_column(String(20))  # caught, fainted, missed
     catch_level: Mapped[int | None] = mapped_column(SmallInteger)
     faint_level: Mapped[int | None] = mapped_column(SmallInteger)
+    death_cause: Mapped[str | None] = mapped_column(String(100))
     caught_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), server_default=func.now()
     )

backend/src/app/schemas/encounter.py

@@ -17,6 +17,7 @@ class EncounterUpdate(CamelModel):
     nickname: str | None = None
     status: str | None = None
     faint_level: int | None = None
+    death_cause: str | None = None
 
 
 class EncounterResponse(CamelModel):
@@ -28,6 +29,7 @@ class EncounterResponse(CamelModel):
     status: str
     catch_level: int | None
     faint_level: int | None
+    death_cause: str | None
     caught_at: datetime