Feature/nostr embedded bitchat (#448)

* UI: prefer mesh radio icon when connected; map short peer ID to full Noise key; rename ephemeral mapping to shortIDToNoiseKey; ensure header flips to purple globe on disconnect and keeps name.

* chore: stop tracking build artifacts; ignore .DerivedData and .Result*

* logging: add global threshold via BITCHAT_LOG_LEVEL and demote chatty logs to debug; keep critical errors/warnings and key state transitions

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Co-authored-by: jack <jackjackbits@users.noreply.github.com>

.gitignore

@@ -18,6 +18,7 @@ xcuserdata/
 ## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
 build/
 DerivedData/
+.DerivedData/
 *.moved-aside
 *.pbxuser
 !default.pbxuser
@@ -65,3 +66,7 @@ __pycache__/
 ## Temporary files
 *.tmp
 *.temp
+
+# Local build results
+.Result*/
+.Result*.xcresult/