Odoo Release Updates

[REF] base/website: introduce website model in base and put it on `env`

[IMP] mail: show subject in message even when equaling suggested

[FIX] mail: update subject on reply/forward

[FIX] mail: reload subject on composer closing

[FIX] mail: correctly order HTML tracking values

[FIX] mail: fix mismatched model for author_id

[FIX] mail: allow channel owners to assign admins

[IMP] *: migrate t-ref to Owl 3 signals

[REF] mail: remove `onRendered`

[IMP] mail: speedup quick emojis pop out

[IMP] mail: quickly cleanup '_is_thread_message' usage

[REF] mail: simplify notification API with message record

[FIX] mail: strip bg-o-color class from body_html

[IMP] mail: align group chat icon

[FIX] mail: fix /mail/store race condition on logout

[IMP] mail: update notifications button title

[FIX] mail: no infinite loop on discuss page load

[IMP] *: use user-local date for date-only flows

[FIX] mail: disable chatter attachment sync for action composer

[IMP] html_editor, mail: introduce user profile signature command

[CLN] discuss: remove obsolete toRaw calls following Owl 3 migration

[FIX] mail: Perf: use body class instead of :has selector

[PERF] mail: do not fetch every pinned channel from chat hub

[FIX] mail: group separator always shown in suggestion list

[IMP] mail: improve welcome page ui/ux

[REF] mail: remove `onWillRender` using OWL3 `computed`

[IMP] web, mail: Use Bottom Sheet for touch devices

[FIX] mail: show URL as link preview display name

[FIX] mail: JSONDecodeError on CORS preflight of /mail/store

[REF] mail: replace useState by OWL 3 proxy/signal