fix(0.7.1): Plugin Check follow-up — tested-up-to bump + .DS_Store re-cleanup

Re-ran PCP after v0.7.0 — issue count 169 → 4. Closes the only real
one of the four:

- Tested up to: 6.7 → 7.0 in readme.txt (PCP outdated_tested_upto_header).
  WordPress 7.0 is current.
- Stable Tag bumped to 0.7.1 in readme.txt.

Removed (again)
- .DS_Store files (root + assets/). macOS Finder regenerated them
  between PCP runs; they will not be present in the submission zip.

Known PCP residue (not addressable in source)
- .gitignore triggers a hidden_files WARNING on PCP. Keeping it is
  needed for git; will be excluded from the submission zip per WP.org
  packaging conventions.

Files: radio.php (version), readme.txt (Tested-up-to + Stable Tag +
new 0.7.1 changelog + upgrade notice), CHANGELOG.md,
inc/about.php (rotate v0.7.1 → latest, v0.7.0 → earlier list),
.DS_Store files deleted.

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

readme.txt

@@ -3,8 +3,8 @@ Contributors: davidtkeane
 Donate link: https://buymeacoffee.com/davidtkeane
 Tags: radio, music, audio, internet radio, background music
 Requires at least: 5.3
-Tested up to: 6.7
-Stable tag: 0.7.0
+Tested up to: 7.0
+Stable tag: 0.7.1
 Requires PHP: 7.4
 License: GPLv2 or later
 License URI: https://www.gnu.org/licenses/gpl-2.0.html
@@ -71,6 +71,9 @@ SomaFM's track-info endpoint (`somafm.com/songs/{station}.json`) is fetched best
 
 == Changelog ==
 
+= 0.7.1 =
+* Plugin Check follow-up — `Tested up to` bumped from 6.7 to 7.0 (PCP `outdated_tested_upto_header`). Stray `.DS_Store` files re-deleted (macOS Finder regenerated them between PCP runs; they won't be in the submission zip).
+
 = 0.7.0 =
 * WordPress.org submission prep — full PCP-clean. Plugin name normalised to **RangerHQ Radio** (SomaFM stays in the description as the data source). Text Domain renamed `radio` → `a-radio` everywhere (134 i18n call sites updated). Six `printf` / `sprintf` calls now carry translator comments. All admin `$_POST` access now `wp_unslash()` + `sanitize_*` at the access point. `Requires at least` bumped to 5.3 (matches `wp_date()` usage). Pop-out window now uses `wp_enqueue_*` + `wp_print_styles()` / `wp_print_footer_scripts()` instead of raw `<link>` / `<script>` tags; popup-specific CSS moved into `radio.css` under `body.radio-popout` scope. `.DS_Store` files removed. Proper `readme.txt`.
 
@@ -103,5 +106,8 @@ SomaFM's track-info endpoint (`somafm.com/songs/{station}.json`) is fetched best
 
 == Upgrade Notice ==
 
+= 0.7.1 =
+PCP follow-up — `Tested up to` bumped to 7.0. No user-visible changes.
+
 = 0.7.0 =
 WordPress.org submission prep. Plugin name now "RangerHQ Radio". Text Domain renamed `radio` → `a-radio`. No user-visible behaviour changes; settings, history, and favourites all survive the upgrade.