chore: bump version to 0.7.1 + v0.7.1 release notes

Bumps Cargo.toml + tauri.conf.json + android tauri.properties
(versionCode 7000 → 7001). v0.7.1 = UI polish + bug-fix pass on
v0.7.0, wire-compatible.

download.html: new v0.7.1 section at top with detailed bullets for:
- Friend button (follow+vouch)
- Default visibility = Extended Friends (FoF)
- Network Identity → Device Address rename
- Settings persona/device clarity
- Profile-display-name bug fix
- Redundancy panel author-query fix
- My Posts horizontal-scroll regression fix

v0.7.0 entry retained below with full original release notes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -2732,7 +2732,7 @@ checksum = "92ecc6618181def0457392ccd0ee51198e065e016d1d527a7ac1b6dc7c1f09d2"
 
 [[package]]
 name = "itsgoin-cli"
-version = "0.7.0"
+version = "0.7.1"
 dependencies = [
  "anyhow",
  "hex",
@@ -2744,7 +2744,7 @@ dependencies = [
 
 [[package]]
 name = "itsgoin-core"
-version = "0.7.0"
+version = "0.7.1"
 dependencies = [
  "anyhow",
  "base64 0.22.1",
@@ -2767,7 +2767,7 @@ dependencies = [
 
 [[package]]
 name = "itsgoin-desktop"
-version = "0.7.0"
+version = "0.7.1"
 dependencies = [
  "anyhow",
  "base64 0.22.1",