Summary

Adds the ability to mute an entire thread. Pick "Mute thread" from any note's ⋯ menu and the whole conversation, including every reply, disappears from feeds, notifications, and the unread counts. Stored privately in your NIP-51 kind-10000 mute list, so it syncs across your devices and interops with other clients.

• One helper, both ends. getThreadRootId(evt) = getRootEventHexId(evt) ?? evt.id (NIP-10 aware) computes a note's conversation root; it's used identically at store-time (mute the clicked note's root) and filter-time (isInMutedThread(evt, set)). O(1) per note, no reply-tree walking, robust with partial threads.
• Mute by root. Muting from any note (even a deep reply) silences the whole conversation, because every descendant carries the root's id in its NIP-10 root marker.
• Private only. muteThread writes the ['e', rootId] into the NIP-44-encrypted portion of the mute list; unmuteThread strips from both public and private. Mirrors the existing pubkey-mute pattern (same changing lock, optimistic overlay + rollback).
• Treated exactly like a muted user, at every tier:
  • Hard-hide in feeds (NoteList, NoteCard), thread reply lists (useFilteredReplies), notifications (NotificationItem), and the unread counts (column badge + favicon/title, via notificationFilter).
  • Collapse + reveal wherever a note still renders through <Note> but isn't list-filtered (quotes/embeds and direct detail views): a <MutedNote reason=\"thread\"> placeholder — "This note is from a thread you muted" + "Temporarily display this note." MutedNote was generalized with a reason prop so user- and thread-mute share one component.
• Manage it. New "Muted threads" section in Settings → Muted list shows each muted root with an Unmute button.

Ships as v26.12.2 with a "What's new" entry.

Notes for reviewers

• Mirrors muted-user handling 1:1. Every place that special-cases a muted author now has the parallel muted-thread branch (hard-hide tiers + the <Note> collapse/reveal tier). Feeds + notifications hard-hide; embeds/detail collapse-with-reveal — same as users.
• muteEventIdSet also honors any pre-existing public e-tag thread mutes already in a user's kind-10000 list (written by other clients). Previously never applied at filter time; now they hide those threads. Strictly more NIP-51-compliant.

Test coverage

22 unit tests on the core predicate + helpers (getThreadRootId, isInMutedThread, getEventIdsFromETags/appendETag/stripETag, notificationFilter thread exclusion). Full suite: 855 passing, npm run build clean.

Manual test plan (needs a signing account)

• ⋯ menu on a thread note shows "Mute thread"; clicking it removes the note + its replies from the feed
• A mention from that thread leaves the Notifications column and the unread badge/count drops
• A note that quotes the muted thread now shows the embed collapsed to "This note is from a thread you muted" with a "Temporarily display this note" reveal (same as quoting a muted user)
• Settings → Muted list shows a "Muted threads" section; "Unmute" makes the thread reappear and the row vanishes immediately
• Reload: thread stays hidden (persisted to kind-10000) and still listed under "Muted threads"
• Arabic (Settings → Languages → العربية): menu item + section + placeholder render correctly RTL

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