chore: prepare release 1.19.0

[sable-actions]

Important

Merging this PR will create a new release.

Features

• Added a GIF search functionality (#970 by @7w1, @nikiwastaken)
• Change animal identity to allow arbitrary animals (#984 by @nushea)
• Add a new Mobile Context (#946 by @7w1, @nushea)
• Add Copy Message button to copy unformatted version. (#1001 by @nushea)
• Change profile handle part to a button that copies it (#981 by @nushea)
• Add reactions to arbitrary events (#946 by @7w1, @nushea)
• Add a context menu for copying and downloading images. (#994 by @nikiwastaken, @nushea)
• Add search message keybind and combine sidebar items. (#943 by @nushea)
• Add option for showing icons only when available and changed default to it (#978 by @nushea)
• Add CTRL+E shortcut to editor to bring sticker menu up (#982 by @nushea)
• Redesign the user menu tab (#990 by @nikiwastaken, @nushea)

Fixes

• Swap to using the stable identifier m.recent_emoji for recent emojis and add migration logic. (#1009 by @7w1)
• Fix leaving modal looking outsized (#991 by @nushea)
• Fix cat status not being present on its own. (#971 by @nikiwastaken)
• Fix encrypted thread messages not appearing until reopened. (#975 by @7w1)
• Fix account switcher's add account button redirecting to the wrong path when hashRouter is enabled (#993 by @EphemeralFog)
• Fix mentions not sending in non-textual replies (#1004 by @nushea)
• Fix crash when opening pins with stickers. (#972 by @7w1)
• Fix registration not working when accessed from add account button (#992 by @EphemeralFog)
• Reverse the order of message header elements in the right aligned bubbles layout. (#967 by @EphemeralFog)
• Fix timeline sorting order regression when "show hidden events" is enabled. (#974 by @7w1)
• Fix ghost quickmenu (#946 by @7w1, @nushea)
• Fix Collapsed mode showing the wrong icon (#978 by @nushea)
• Fix poll crashing sable if interacted with different clients (#969 by @nushea)
• Update @sableclient/twemoji-font to fix missing Twemoji emoji coverage. (#964 by @7w1)

[github-actions]

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