Started working on contact resolution

kordophone-db/migrations/2025-06-01-000000_add_contact_id_to_participants/down.sql

@@ -0,0 +1,14 @@
+-- Revert participants table to remove contact_id column
+-- SQLite does not support DROP COLUMN directly, so we recreate the table without contact_id
+PRAGMA foreign_keys=off;
+CREATE TABLE participants_backup (
+    id INTEGER NOT NULL PRIMARY KEY,
+    display_name TEXT,
+    is_me BOOL NOT NULL
+);
+INSERT INTO participants_backup (id, display_name, is_me)
+    SELECT id, display_name, is_me
+    FROM participants;
+DROP TABLE participants;
+ALTER TABLE participants_backup RENAME TO participants;
+PRAGMA foreign_keys=on;

kordophone-db/migrations/2025-06-01-000000_add_contact_id_to_participants/up.sql

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+-- Add contact_id column to participants to store an external contact identifier (e.g., Folks ID)
+ALTER TABLE participants ADD COLUMN contact_id TEXT;