Task work log, inline writing assistant, task editor sidebar layout

Backend:
- Migration 0021: task_logs table (FK → notes + users, CASCADE, indexed)
- models/task_log.py: SQLAlchemy model with to_dict()
- services/task_logs.py: CRUD with ownership checks, _UNSET sentinel for optional duration clear
- routes/task_logs.py: GET/POST/PATCH/DELETE /api/tasks/<id>/logs
- services/tools.py: log_work LLM tool (resolves task by title, creates log entry)
- services/generation_task.py: retry assist generation up to 3× on HTTP 500

Frontend:
- types/task.ts: TaskLog interface
- TaskLogSection.vue: chronological work log with date+time timestamps, duration badge, inline edit, autofocus
- InlineAssistPanel.vue: streaming preview + diff review rendered inline in editor column
- useAssist.ts: removed chatStore.chatReady gate; toast notifications for errors
- NoteEditorView.vue + TaskEditorView.vue: inline assist panel, aside restricted to idle state
- TaskEditorView.vue: two-column layout (editor+log left, metadata sidebar right), body defaults to Preview, sidebarOpen accordion for mobile
- editor-shared.css: .assist-active-hint style

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

alembic/versions/0021_add_task_logs.py

@@ -0,0 +1,28 @@
+"""Add task_logs table."""
+
+from alembic import op
+
+revision = "0021"
+down_revision = "0020"
+
+
+def upgrade() -> None:
+    op.execute("""
+        CREATE TABLE IF NOT EXISTS task_logs (
+            id               SERIAL PRIMARY KEY,
+            task_id          INTEGER NOT NULL REFERENCES notes(id) ON DELETE CASCADE,
+            user_id          INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+            content          TEXT NOT NULL,
+            duration_minutes INTEGER,
+            created_at       TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
+            updated_at       TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
+        )
+    """)
+    op.execute("CREATE INDEX IF NOT EXISTS ix_task_logs_task_id ON task_logs(task_id)")
+    op.execute("CREATE INDEX IF NOT EXISTS ix_task_logs_user_id ON task_logs(user_id)")
+
+
+def downgrade() -> None:
+    op.execute("DROP INDEX IF EXISTS ix_task_logs_user_id")
+    op.execute("DROP INDEX IF EXISTS ix_task_logs_task_id")
+    op.execute("DROP TABLE IF EXISTS task_logs")