core: render web previews for channels (#7029)

* plan: web previews for channels

* types for recipient side to support channel web previews and domain names

* fix

* migrations

* update schema and api types

* update schema

* rename migrations

* core: render channel preview data

* core: render channel preview data in relays

* website: use cpp to inject JS functions

* JSC files

* remove directory.js

* channel preview renderer

* Revert "cli: fix redraw slowness (#6735)"

This reverts commit b801d77c74.

* sample channel page

* default avatar

* rename options

* better layout

* layout

* images

* some fixes

* tails

* markdown colors

* image sizes

* reactions

* fix reactions

* fewer avatars

* forward icon

* command to change group access parameters

* view public group access changes in CLI

* media metadata color

* ios: group web access ui

* update ui

* add init

* kotlin, labels

* update page

* update relay base URL

* fix

* ios update channel web page info

* update kotlin layout

* use cards

* update layout

* use domains for relay data, path is fixed

* update embed code

* fix bots api

* include only history items and senders

* update preview JS/HTML

* show different error if link is different

* remove stale json files

* better layout

* layout fixes

* improve layout

* improve layout

* update embed code

* web cta

* better layout

* buttons

* layout

* paddings

* desktop cta

* desktop cta

* cta layout

* fonts

* paddings

* paddings

* more paddings

* copy link

* read more

* hide avatar and placeholder when all messages are from channel

* color scheme

* fix color

* improve

* layout

* welcome message

* dark mode colors

* padding

* font size

* overscroll

* font

* logo on button

* better join

* buttons

* refactor

* another logo

* text

* desktop button

* button text

* center

* fix svg

* padding

* smaller gap

* render channel on any message changes etc

* fixes

* atomic file updates, escape attributes

* fix tests

* more tests

* more efficient rendering

* improve security

* sanitize links, include mentioned members

* schema

* fixes

* improve rendering

* fix showing correct subscribers count

* fix member names

---------

Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>

src/Simplex/Chat/Protocol.hs

@@ -83,12 +83,13 @@ import Simplex.Messaging.Version hiding (version)
 -- 15 - support specifying message scopes for group messages (2025-03-12)
 -- 16 - support short link data (2025-06-10)
 -- 17 - allow host voice messages during member approval regardless of group voice setting (2026-02-10)
+-- 18 - relay web capabilities (2026-05-31)
 
 -- This should not be used directly in code, instead use `maxVersion chatVRange` from ChatConfig.
 -- This indirection is needed for backward/forward compatibility testing.
 -- Testing with real app versions is still needed, as tests use the current code with different version ranges, not the old code.
 currentChatVersion :: VersionChat
-currentChatVersion = VersionChat 17
+currentChatVersion = VersionChat 18
 
 -- This should not be used directly in code, instead use `chatVRange` from ChatConfig (see comment above)
 supportedChatVRange :: VersionRangeChat
@@ -155,6 +156,10 @@ shortLinkDataVersion = VersionChat 16
 memberSupportVoiceVersion :: VersionChat
 memberSupportVoiceVersion = VersionChat 17
 
+-- relay sends web preview capabilities to owner
+relayWebCapVersion :: VersionChat
+relayWebCapVersion = VersionChat 18
+
 agentToChatVersion :: VersionSMPA -> VersionChat
 agentToChatVersion v
   | v < pqdrSMPAgentVersion = initialChatVersion