Odoo Release Updates

[REF] mail: make discuss.channel inherit mail.thread (JS)

[IMP] web, mail *: improve states of systray items

[FIX] mail: fix thread action button and messaging menu UI

[IMP] mail: show message seen indicator in message preview

[FIX] mail: fix runbot issue 231582 (no web_save when manually saving)

[FIX] mail: fix race condition with Enter in channel public tour

[FIX] mail: fix access right error in mentioning users in chatter

[FIX] mail: return BlurManager instance to update blur properties in real-time

[FIX] mail: allow using `@everyone` without mentioning specific users

[IMP] mail: PWA shows discuss badge counter on app icon

[IMP] mail: enrich use suggestion in HTML composer

[IMP] mail: move channel_type to discuss_channel_model

[FIX] mail: fix channel mention restore when editing

[FIX] mail, im_livechat: avoid double prettify of message content

[FIX] mail: mention links should not be editable

[REF] mail: remove support of _field_store_repr

[REF] discuss: call miscellaneous cleanup

[IMP] base: Warning on unused attributes in ir.qweb

[FIX] core: Add warning for contraint using PG18 suffix

[REM] mail: redundant check constraint on discuss channels' types

[IMP] mail: join channel action button

[REF] all: model's description should be singular

[FIX] mail: prevent traceback closing non-mail fullscreen

[FIX] mail: hide unpin button for guest users

[FIX] discuss: prevent crash when updating session info

[FIX] mail: align '+' composer action

[FIX] mail: correct record list indexed assignment

[IMP] web,*: reduce TagsList overrides

[REM] mail: remove unused /mail/thread/recipients/fields route

[IMP] web,*: replace tagslist by t-foreach