diff --git a/CHANGELOG.md b/CHANGELOG.md
index f2e8d66f..e5343ca2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,25 @@
 # Hermes Web UI -- Changelog
 
+## [v0.51.13] — 2026-05-06 — single-PR composer UX
+
+### Added
+
+- **PR #1758** — Click pasted/attached image thumbnails in the composer to lightbox-zoom them. When pasting/dropping screenshots into the composer, the 56×56 thumbnail in each chip now opens the existing image lightbox on click — same modal that's been wired for message-attached images since v0.50.x. Cursor changes to `zoom-in` (was `default`, actively misleading) and a subtle hover emphasis (4% scale + 5% brightness, 120ms ease, hover-capable devices only via `@media (hover: hover)`) gives instant visual feedback. Audio/video chips are unaffected — they keep their inline native controls and never render an `.attach-thumb` IMG. Refs #1733. Pairs with the companion Mac PR `hermes-webui/hermes-swift-mac#74` for sequential-paste filename uniqueness — paste, paste, paste, click any to verify, send.
+
+### Tests
+
+4637 → **4642 collected** (+5 regression tests across composer chip wiring + cursor affordance). 4630 passed, 9 skipped (test-isolation prong-2 noise), 3 xpassed, 0 failed in 145s.
+
+### Pre-release verification
+
+- @nesquena independently APPROVED with exhaustive headless-Chrome behavioural harness verifying all 4 click paths (thumb-image, ×-on-image, ×-on-audio, audio-element). Pre-fix verification confirmed 4/5 of the new tests catch regressions to the previous state.
+- Stage-307: clean rebase + clean merge (no conflicts).
+- All JS files syntax-clean (`node -c static/ui.js`).
+- pytest: 4630 passed, 0 failed (single clean run).
+- `scripts/run-browser-tests.sh`: all 11 endpoints PASS on isolated port 8789.
+- Pre-stamp re-fetch: PR head still matches local rebase — no late commits.
+- Opus advisor: SHIP, all 6 verification questions clean, 0 MUST-FIX. One non-blocking nit (wrap `:hover` in `@media (hover: hover)` for iPad sticky-hover hygiene) absorbed in-release as a defensive 3-LOC cleanup.
+
 ## [v0.51.12] — 2026-05-06 — 3-PR full-sweep batch
 
 ### Fixed
diff --git a/ROADMAP.md b/ROADMAP.md
index 68ed6695..803c49ae 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -2,7 +2,7 @@
 
 > Web companion to the Hermes Agent CLI. Same workflows, browser-native.
 >
-> Last updated: v0.51.12 (May 6, 2026) — 4632 tests collected — 3-PR full-sweep batch (#1746, #1752, #1753)
+> Last updated: v0.51.13 (May 6, 2026) — 4642 tests collected — single-PR composer UX (#1758)
 > Test source: `pytest tests/ --collect-only -q`
 > Per-version detail: see [CHANGELOG.md](./CHANGELOG.md)
 
diff --git a/TESTING.md b/TESTING.md
index 69190190..be959df9 100644
--- a/TESTING.md
+++ b/TESTING.md
@@ -1835,8 +1835,8 @@ Bridged CLI sessions:
 
 ---
 
-*Last updated: v0.51.12, May 6, 2026*
-*Total automated tests collected: 4632*
+*Last updated: v0.51.13, May 6, 2026*
+*Total automated tests collected: 4642*
 *Regression gate: tests/test_regressions.py*
 *Run: pytest tests/ -v --timeout=60*
 *Source: <repo>/*
diff --git a/static/style.css b/static/style.css
index dfa603b9..a30cd3be 100644
--- a/static/style.css
+++ b/static/style.css
@@ -895,7 +895,9 @@
   .attach-media-icon{display:inline-flex;align-items:center;color:var(--accent-text);}
   .attach-chip-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
   .attach-thumb{width:56px;height:56px;object-fit:cover;border-radius:4px;display:block;cursor:zoom-in;transition:filter .12s ease, transform .12s ease;}
-  .attach-thumb:hover{filter:brightness(1.05);transform:scale(1.04);}
+  @media (hover: hover) {
+    .attach-thumb:hover{filter:brightness(1.05);transform:scale(1.04);}
+  }
   textarea#msg{width:100%;background:transparent;border:none;outline:none;color:var(--text);font-size:16px;line-height:1.65;padding:12px 16px 6px;resize:none;min-height:44px;max-height:200px;font-family:inherit;}
   textarea#msg::placeholder{color:var(--muted);}
   .composer-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:6px 10px 10px;position:relative;container-type:inline-size;container-name:composer-footer;}