Add signalement (flag) tags for problem lines on /lignes

New field_flag: free-tagging taxonomy reference (multi-value,
auto-create) on ligne_comptable, for marking a line with an
unstructured problem description (e.g. "client impayé") that can't be
detected automatically the way the répartition écart already is.

- New "Signalement" column, inline-editable like Client/Facture/Libellé
  (comma-separated tags, datalist autocomplete, server-side auto-create
  of unknown tags -- same pattern LedgerActionsController already used
  for Client, now shared via findOrCreateTerm()).
- New "Signalées uniquement" filter, mirroring "Écarts uniquement".
- Flagged rows get a distinct amber left-edge accent (box-shadow, not
  border) so a row that's both in écart and signalée shows both
  indicators without one overwriting the other.
- Native node add/edit form gets the field for free via core's
  entity_reference_autocomplete_tags widget.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

config/sync/core.entity_form_display.node.ligne_comptable.default.yml

@@ -6,6 +6,7 @@ dependencies:
     - field.field.node.ligne_comptable.field_client
     - field.field.node.ligne_comptable.field_date_ligne
     - field.field.node.ligne_comptable.field_entree_liee
+    - field.field.node.ligne_comptable.field_flag
     - field.field.node.ligne_comptable.field_montant_ht
     - field.field.node.ligne_comptable.field_montant_ttc
     - field.field.node.ligne_comptable.field_notes
@@ -54,6 +55,16 @@ content:
       size: 60
       placeholder: ''
     third_party_settings: {  }
+  field_flag:
+    type: entity_reference_autocomplete_tags
+    weight: 8
+    region: content
+    settings:
+      match_operator: CONTAINS
+      match_limit: 10
+      size: 60
+      placeholder: ''
+    third_party_settings: {  }
   field_montant_ht:
     type: number
     weight: 3

config/sync/core.entity_view_display.node.ligne_comptable.default.yml

@@ -6,6 +6,7 @@ dependencies:
     - field.field.node.ligne_comptable.field_client
     - field.field.node.ligne_comptable.field_date_ligne
     - field.field.node.ligne_comptable.field_entree_liee
+    - field.field.node.ligne_comptable.field_flag
     - field.field.node.ligne_comptable.field_montant_ht
     - field.field.node.ligne_comptable.field_montant_ttc
     - field.field.node.ligne_comptable.field_notes
@@ -48,6 +49,14 @@ content:
     third_party_settings: {  }
     weight: 2
     region: content
+  field_flag:
+    type: entity_reference_label
+    label: above
+    settings:
+      link: true
+    third_party_settings: {  }
+    weight: 8
+    region: content
   field_montant_ht:
     type: number_decimal
     label: above

config/sync/field.field.node.ligne_comptable.field_flag.yml

@@ -0,0 +1,25 @@
+uuid: c89c4d76-167a-4b60-b5f1-50aa3b349b80
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_flag
+    - node.type.ligne_comptable
+    - taxonomy.vocabulary.flag
+id: node.ligne_comptable.field_flag
+field_name: field_flag
+entity_type: node
+bundle: ligne_comptable
+label: Signalement
+description: ''
+required: false
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings:
+  handler: 'default:taxonomy_term'
+  handler_settings:
+    target_bundles:
+      flag: flag
+    auto_create: true
+field_type: entity_reference

config/sync/field.storage.node.field_flag.yml

@@ -0,0 +1,20 @@
+uuid: 0921a265-d874-487c-bf0a-09a389322d6b
+langcode: en
+status: true
+dependencies:
+  module:
+    - node
+    - taxonomy
+id: node.field_flag
+field_name: field_flag
+entity_type: node
+type: entity_reference
+settings:
+  target_type: taxonomy_term
+module: core
+locked: false
+cardinality: -1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false

config/sync/taxonomy.vocabulary.flag.yml

@@ -0,0 +1,9 @@
+uuid: 01c508f8-ba10-40d7-8d8b-5c2c362bd761
+langcode: en
+status: true
+dependencies: {  }
+name: Signalement
+vid: flag
+description: null
+weight: 0
+new_revision: false