Buzz Desktop v0.4.6

• Polish agent and team sharing and snapshots (#1852) (2f3fa586f)
• fix(desktop): filter punctuation from avatar initials (#1904) (63e099709)
• fix(desktop): preserve snapshot attachment URLs (#1905) (1ab7bbfe4)
• Chat-first agent creation via portable buzz CLI drafts (#1878) (54e174b5e)
• feat(desktop): enable community rail by default (#1902) (55a46b063)
• feat(desktop): redesign Nostr bind verification flow (#1850) (abfe78aaf)
• fix(desktop): simplify sign out settings row (#1903) (3e8dae7ff)
• feat(desktop): Send feedback modal + profile presence chip (#1756) (f5c33d333)
• fix(desktop): seed timeline virtualization row heights (#1887) (406cf7911)
• fix(desktop): dedupe react-dismissable-layer to stop modal menu → dialog freezes (#1899) (366567ac2)
• fix(desktop): clean up Remind me later dialog footer and loading state (#1898) (40fe65095)
• fix(desktop): let sidebar action card description wrap over multiple lines (#1891) (b36ee3e30)
• mesh: upgrade runtime, enforce membership, add shared compute provider (#1656) (54638ff4b)