DRY refactoring pass: shared mixins, route helpers, composables, CSS

Backend:
- models/base.py: TimestampMixin + CreatedAtMixin; applied to all 10+ models
- routes/utils.py: not_found() + parse_iso_date() helpers; used across all route files
- routes/milestones.py: _milestone_dict() helper replaces 5 repeated to_dict + progress blocks

Frontend:
- 5 new composables: useAutoSave, useEditorGuards, useTagSuggestions,
  useFloatingAssist, useListKeyboardNavigation
- ConfirmDialog.vue: reusable confirm modal replacing inline <teleport> blocks
- editor-shared.css: sidebar CSS consolidated from both editor views
- viewer-shared.css: context-bar/breadcrumb CSS consolidated from both viewer views
- NoteEditorView + TaskEditorView: ~120 lines each replaced with composable calls;
  duplicate scoped sidebar CSS removed
- NotesListView + TasksListView: inline keyboard-nav replaced with composable
- NoteViewerView + TaskViewerView: duplicate context-bar CSS removed

No behaviour changes. Net: -634 lines, +237 lines across 31 files.

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

src/fabledassistant/models/__init__.py

@@ -16,6 +16,9 @@ class Base(DeclarativeBase):
     pass
 
 
+from fabledassistant.models.base import CreatedAtMixin, TimestampMixin  # noqa: E402, F401
+
+
 from fabledassistant.models.note import Note, TaskPriority, TaskStatus  # noqa: E402, F401
 from fabledassistant.models.conversation import Conversation, Message  # noqa: E402, F401
 from fabledassistant.models.setting import Setting  # noqa: E402, F401

src/fabledassistant/models/base.py

@@ -0,0 +1,21 @@
+from datetime import datetime, timezone
+
+from sqlalchemy import DateTime
+from sqlalchemy.orm import Mapped, mapped_column
+
+
+class TimestampMixin:
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        default=lambda: datetime.now(timezone.utc),
+        onupdate=lambda: datetime.now(timezone.utc),
+    )
+
+
+class CreatedAtMixin:
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
+    )

src/fabledassistant/models/conversation.py

@@ -1,14 +1,13 @@
-from datetime import datetime, timezone
-
-from sqlalchemy import DateTime, ForeignKey, Index, Integer, Text
+from sqlalchemy import ForeignKey, Index, Integer, Text
 from sqlalchemy import inspect
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from fabledassistant.models import Base
+from fabledassistant.models.base import CreatedAtMixin, TimestampMixin
 
 
-class Conversation(Base):
+class Conversation(Base, TimestampMixin):
     __tablename__ = "conversations"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -17,14 +16,6 @@ class Conversation(Base):
     )
     title: Mapped[str] = mapped_column(Text, default="")
     model: Mapped[str] = mapped_column(Text, default="")
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
-    updated_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True),
-        default=lambda: datetime.now(timezone.utc),
-        onupdate=lambda: datetime.now(timezone.utc),
-    )
 
     messages: Mapped[list["Message"]] = relationship(
         back_populates="conversation",
@@ -53,7 +44,7 @@ class Conversation(Base):
         }
 
 
-class Message(Base):
+class Message(Base, CreatedAtMixin):
     __tablename__ = "messages"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -67,9 +58,6 @@ class Message(Base):
         Integer, ForeignKey("notes.id", ondelete="SET NULL"), nullable=True
     )
     tool_calls: Mapped[list | None] = mapped_column(JSONB, nullable=True)
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
 
     conversation: Mapped["Conversation"] = relationship(back_populates="messages")
 

src/fabledassistant/models/milestone.py

@@ -1,12 +1,11 @@
-from datetime import datetime, timezone
-
-from sqlalchemy import DateTime, ForeignKey, Integer, Text
+from sqlalchemy import ForeignKey, Integer, Text
 from sqlalchemy.orm import Mapped, mapped_column
 
 from fabledassistant.models import Base
+from fabledassistant.models.base import TimestampMixin
 
 
-class Milestone(Base):
+class Milestone(Base, TimestampMixin):
     __tablename__ = "milestones"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -16,14 +15,6 @@ class Milestone(Base):
     description: Mapped[str | None] = mapped_column(Text, nullable=True)
     status: Mapped[str] = mapped_column(Text, default="active")
     order_index: Mapped[int] = mapped_column(Integer, default=0)
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
-    updated_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True),
-        default=lambda: datetime.now(timezone.utc),
-        onupdate=lambda: datetime.now(timezone.utc),
-    )
 
     def to_dict(self) -> dict:
         return {

src/fabledassistant/models/note.py

@@ -1,11 +1,12 @@
 import enum
-from datetime import date, datetime, timezone
+from datetime import date
 
-from sqlalchemy import Date, DateTime, ForeignKey, Index, Integer, Text
+from sqlalchemy import Date, ForeignKey, Index, Integer, Text
 from sqlalchemy.dialects.postgresql import ARRAY
 from sqlalchemy.orm import Mapped, mapped_column
 
 from fabledassistant.models import Base
+from fabledassistant.models.base import TimestampMixin
 
 
 class TaskStatus(str, enum.Enum):
@@ -21,7 +22,7 @@ class TaskPriority(str, enum.Enum):
     high = "high"
 
 
-class Note(Base):
+class Note(Base, TimestampMixin):
     __tablename__ = "notes"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -43,14 +44,6 @@ class Note(Base):
     status: Mapped[str | None] = mapped_column(Text, nullable=True)
     priority: Mapped[str | None] = mapped_column(Text, nullable=True)
     due_date: Mapped[date | None] = mapped_column(Date, nullable=True)
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
-    updated_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True),
-        default=lambda: datetime.now(timezone.utc),
-        onupdate=lambda: datetime.now(timezone.utc),
-    )
 
     __table_args__ = (
         Index("ix_notes_tags", "tags", postgresql_using="gin"),

src/fabledassistant/models/note_draft.py

@@ -1,12 +1,11 @@
-from datetime import datetime, timezone
-
-from sqlalchemy import DateTime, ForeignKey, Integer, Text
+from sqlalchemy import ForeignKey, Integer, Text
 from sqlalchemy.orm import Mapped, mapped_column
 
 from fabledassistant.models import Base
+from fabledassistant.models.base import TimestampMixin
 
 
-class NoteDraft(Base):
+class NoteDraft(Base, TimestampMixin):
     __tablename__ = "note_drafts"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -16,14 +15,6 @@ class NoteDraft(Base):
     original_body: Mapped[str] = mapped_column(Text)
     instruction: Mapped[str] = mapped_column(Text, default="")
     scope: Mapped[str] = mapped_column(Text, default="document")
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
-    updated_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True),
-        default=lambda: datetime.now(timezone.utc),
-        onupdate=lambda: datetime.now(timezone.utc),
-    )
 
     def to_dict(self) -> dict:
         return {

src/fabledassistant/models/note_version.py

@@ -1,12 +1,11 @@
-from datetime import datetime, timezone
-
-from sqlalchemy import ARRAY, DateTime, ForeignKey, Integer, Text
+from sqlalchemy import ARRAY, ForeignKey, Integer, Text
 from sqlalchemy.orm import Mapped, mapped_column
 
 from fabledassistant.models import Base
+from fabledassistant.models.base import CreatedAtMixin
 
 
-class NoteVersion(Base):
+class NoteVersion(Base, CreatedAtMixin):
     __tablename__ = "note_versions"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -15,9 +14,6 @@ class NoteVersion(Base):
     body: Mapped[str] = mapped_column(Text)
     title: Mapped[str] = mapped_column(Text, default="")
     tags: Mapped[list[str]] = mapped_column(ARRAY(Text), default=list)
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
 
     def to_dict(self, include_body: bool = True) -> dict:
         d: dict = {

src/fabledassistant/models/project.py

@@ -1,8 +1,8 @@
 import enum
-from datetime import datetime, timezone
-from sqlalchemy import DateTime, ForeignKey, Integer, Text
+from sqlalchemy import ForeignKey, Integer, Text
 from sqlalchemy.orm import Mapped, mapped_column
 from fabledassistant.models import Base
+from fabledassistant.models.base import TimestampMixin
 
 
 class ProjectStatus(str, enum.Enum):
@@ -11,7 +11,7 @@ class ProjectStatus(str, enum.Enum):
     archived = "archived"
 
 
-class Project(Base):
+class Project(Base, TimestampMixin):
     __tablename__ = "projects"
     id: Mapped[int] = mapped_column(primary_key=True)
     user_id: Mapped[int | None] = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=True)
@@ -20,8 +20,6 @@ class Project(Base):
     goal: Mapped[str] = mapped_column(Text, default="")
     status: Mapped[str] = mapped_column(Text, default="active")
     color: Mapped[str | None] = mapped_column(Text, nullable=True)  # hex color
-    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
-    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
 
     def to_dict(self) -> dict:
         return {

src/fabledassistant/models/push_subscription.py

@@ -1,10 +1,11 @@
-from datetime import datetime, timezone
+from datetime import datetime
 from sqlalchemy import DateTime, ForeignKey, Integer, Text, UniqueConstraint
 from sqlalchemy.orm import Mapped, mapped_column
 from fabledassistant.models import Base
+from fabledassistant.models.base import CreatedAtMixin
 
 
-class PushSubscription(Base):
+class PushSubscription(Base, CreatedAtMixin):
     __tablename__ = "push_subscriptions"
     id: Mapped[int] = mapped_column(primary_key=True)
     user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"))
@@ -12,7 +13,6 @@ class PushSubscription(Base):
     p256dh: Mapped[str] = mapped_column(Text)
     auth: Mapped[str] = mapped_column(Text)
     user_agent: Mapped[str | None] = mapped_column(Text, nullable=True)
-    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
     last_used: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
 
     __table_args__ = (

src/fabledassistant/models/task_log.py

@@ -1,12 +1,11 @@
-from datetime import datetime, timezone
-
-from sqlalchemy import DateTime, ForeignKey, Integer, Text
+from sqlalchemy import ForeignKey, Integer, Text
 from sqlalchemy.orm import Mapped, mapped_column
 
 from fabledassistant.models import Base
+from fabledassistant.models.base import TimestampMixin
 
 
-class TaskLog(Base):
+class TaskLog(Base, TimestampMixin):
     __tablename__ = "task_logs"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -14,14 +13,6 @@ class TaskLog(Base):
     user_id: Mapped[int] = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"))
     content: Mapped[str] = mapped_column(Text)
     duration_minutes: Mapped[int | None] = mapped_column(Integer, nullable=True)
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
-    updated_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True),
-        default=lambda: datetime.now(timezone.utc),
-        onupdate=lambda: datetime.now(timezone.utc),
-    )
 
     def to_dict(self) -> dict:
         return {

src/fabledassistant/models/user.py

@@ -1,12 +1,11 @@
-from datetime import datetime, timezone
-
-from sqlalchemy import DateTime, Index, Text
+from sqlalchemy import Index, Text
 from sqlalchemy.orm import Mapped, mapped_column
 
 from fabledassistant.models import Base
+from fabledassistant.models.base import CreatedAtMixin
 
 
-class User(Base):
+class User(Base, CreatedAtMixin):
     __tablename__ = "users"
 
     id: Mapped[int] = mapped_column(primary_key=True)
@@ -15,9 +14,6 @@ class User(Base):
     password_hash: Mapped[str | None] = mapped_column(Text, nullable=True)
     oauth_sub: Mapped[str | None] = mapped_column(Text, unique=True, nullable=True)
     role: Mapped[str] = mapped_column(Text, nullable=False, default="user")
-    created_at: Mapped[datetime] = mapped_column(
-        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
-    )
 
     __table_args__ = (
         Index("ix_users_username", "username"),