feat: mail list font size, remove Termin toolbar, rename Flagge to Markierung with symbol picker

- Mail list: title and subject font text-xs -> text-sm
- Remove Termin (create-event) toolbar button
- Rename Flagge -> Markierung with select dropdown (star, flag, bookmark, important, question)
- Backend: add flag_type column to Mail model + migration 0006
- Backend: flag_type in MailFlagsUpdate schema, update_flags route, mail_to_response
- Frontend: flag_type in Mail interface, FlagUpdatePayload, MailList symbol display

app/plugins/builtins/mail/migrations/0006_flag_type.sql

@@ -0,0 +1,2 @@
+-- Add flag_type column to mails table for multiple symbol types
+ALTER TABLE mails ADD COLUMN IF NOT EXISTS flag_type VARCHAR(32);

app/plugins/builtins/mail/models.py

@@ -130,6 +130,7 @@ class Mail(Base, TenantMixin):
     body_html_sanitized: Mapped[str] = mapped_column(Text, nullable=False, default="")
     is_seen: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
     is_flagged: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    flag_type: Mapped[str | None] = mapped_column(String(32), nullable=True, default=None)
     is_draft: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
     is_answered: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
     is_forwarded: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)

app/plugins/builtins/mail/routes.py

@@ -1290,6 +1290,8 @@ async def update_flags(
         mail.is_seen = data.is_seen
     if data.is_flagged is not None:
         mail.is_flagged = data.is_flagged
+    if data.flag_type is not None:
+        mail.flag_type = data.flag_type if data.flag_type else None
     if data.is_draft is not None:
         mail.is_draft = data.is_draft
     if data.is_answered is not None:

app/plugins/builtins/mail/schemas.py

@@ -145,6 +145,7 @@ class MailForwardRequest(BaseModel):
 class MailFlagsUpdate(BaseModel):
     is_seen: bool | None = None
     is_flagged: bool | None = None
+    flag_type: str | None = None
     is_draft: bool | None = None
     is_answered: bool | None = None
     is_forwarded: bool | None = None
@@ -166,6 +167,7 @@ class MailResponse(BaseModel):
     body_html_sanitized: str
     is_seen: bool
     is_flagged: bool
+    flag_type: str | None = None
     is_draft: bool
     is_answered: bool
     is_forwarded: bool

app/plugins/builtins/mail/services.py

@@ -1562,6 +1562,7 @@ def mail_to_response(
         "date": mail.received_at.isoformat() if mail.received_at else (mail.sent_at.isoformat() if mail.sent_at else None),
         "is_seen": mail.is_seen,
         "is_flagged": mail.is_flagged,
+        "flag_type": mail.flag_type,
         "is_draft": mail.is_draft,
         "is_answered": mail.is_answered,
         "is_forwarded": mail.is_forwarded,