Add commitment reordering with rank move buttons

Let admins reorder commitment groups and the cards within each group from
the console Commitments tab using up/down buttons, driven by the existing
rank-aware update mutations.

Make the (parent, rank) unique constraints on the commitment tables
DEFERRABLE INITIALLY DEFERRED. Reordering shifts several rows in one
UPDATE, which transiently duplicates a rank and tripped the immediately
enforced constraint with a 23505 error. This matches the other
rank-ordered tables (references, compliance frameworks).

Signed-off-by: Émile Ré <emile@probo.com>

pkg/coredata/migrations/20260716T115429Z.sql

@@ -0,0 +1,40 @@
+-- Copyright (c) 2026 Probo Inc <hello@probo.com>.
+--
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+-- of this software and associated documentation files (the "Software"), to deal
+-- in the Software without restriction, including without limitation the rights
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+-- copies of the Software, and to permit persons to whom the Software is
+-- furnished to do so, subject to the following conditions:
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+-- all copies or substantial portions of the Software.
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+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+-- SOFTWARE.
+
+-- Rank reordering shifts several rows in a single UPDATE, which transiently
+-- collides on the (parent, rank) unique constraint. Make both constraints
+-- DEFERRABLE INITIALLY DEFERRED so uniqueness is only enforced at commit,
+-- matching the other rank-ordered tables (references, compliance frameworks).
+
+ALTER TABLE compliance_portal_commitment_groups
+    DROP CONSTRAINT compliance_portal_commitment_groups_trust_center_id_rank_key;
+
+ALTER TABLE compliance_portal_commitment_groups
+    ADD CONSTRAINT compliance_portal_commitment_groups_trust_center_id_rank_key
+    UNIQUE (trust_center_id, rank)
+    DEFERRABLE INITIALLY DEFERRED;
+
+ALTER TABLE compliance_portal_commitments
+    DROP CONSTRAINT compliance_portal_commitments_group_id_rank_key;
+
+ALTER TABLE compliance_portal_commitments
+    ADD CONSTRAINT compliance_portal_commitments_group_id_rank_key
+    UNIQUE (group_id, rank)
+    DEFERRABLE INITIALLY DEFERRED;