Update CHANGELOG.md with 1.5.2 and 1.5.3; update README.md version reference

CHANGELOG.md

@@ -6,6 +6,25 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
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+## [1.5.3] - 2026-05-19
+
+### Fixed
+
+- **Status panel rendering regression** — the status panel was rendering as a small blank box due to an undefined `--background` CSS variable. Added the missing variable to all three themes (light, dark, mono).
+- **Status panel content destruction** — `showDashboard()` was calling `sp.innerHTML = ''` which destroyed the `status-content` div inside the status panel. Removed this destructive line.
+- **Webhooks panel visibility sync** — the webhooks panel was incorrectly visible on app load. Added explicit hiding of `webhooks-section` in `showDashboard()` to keep it in sync with the status panel (both show/hide together via `toggleStatusPanel()`).
+- **Webhooks panel DOM structure** — reverted webhooks-section to be a sibling of status-panel (not nested inside it), preventing innerHTML operations from affecting webhook elements.
+
+---
+
+## [1.5.2] - 2026-05-19
+
+### Fixed
+
+- **Status panel close button CSP compliance** — replaced inline `onclick` handler with `addEventListener` to comply with CSP nonce policy.
+
+---
+
 ## [1.5.1] - 2026-05-19
 
 ### Fixed