Buzz Desktop v0.3.46

• fix(desktop): preserve agent model/provider when persona snapshot fields are blank (#1583) (a3ee2c569)
• feat(acp,desktop): identify and reap stale agent harness processes (#1582) (3c6c0d447)
• feat(desktop): active-draft badge, send-from-drafts confirm dialog, thread-deleted state (#1581) (b394e95ef)
• fix(desktop): treat baked build env vars as satisfying required agent config (#1580) (b90e80443)
• feat(desktop): add "Copy image" to image right-click context menu (#1579) (683f7fec1)
• fix(nest): use buzz-dev symlink name for dev builds (#1587) (dcbb3ff78)
• fix(composer): address image-editor follow-up nits on #1491 (#1565) (49391d807)
• fix(desktop): render black static boot screen (#1570) (10444d248)
• feat(agents): group activity tool bursts (#1571) (426f04484)
• feat(desktop): aggregated overview rail, commit detail page, and full breadcrumbs (#1573) (c97263901)
• fix(desktop): fetch profiles for reaction actors and thread-reply authors (#1550) (62def1459)
• refactor(desktop): unify EditAgentDialog styling with PersonaDialog (#1540) (c258ffc4a)
• feat(desktop): add 10-minute message grouping window (#1578) (564ead385)
• feat(desktop): unify sidebar section actions into a per-section ⋮ menu (#1577) (d94561795)
• feat(desktop): emoji avatar picker for agents + reliable picker scroll (#1576) (ed84a8735)
• fix(desktop): sync derived active-turn liveness in channel activity path (#1492) (1f5ba5bb2)
• fix(personas): remove goose runtime pin from Fizz built-in (#1566) (e3008b360)
• feat(acp,buzz-agent): thread model name through NIP-AM kind 44200 emit path (#1564) (08e707eb5)
• sync channel sort preferences across clients (#1556) (04a9d1029)
• fix desktop canvas header blur in split channel management (#1558) (2ef26ec21)
• feat(composer): compose spoiler, annotation, and tooltip controls (#1491) (1aa87bb26)
• feat(channel list): add persistent channel sort toggle (#1505) (36ac5243f)