Final-pass polish: support contact UX, audit tooltip, doc refresh

Support teams: contact management moved from a row expander to a modal
(Contacts (N) button per team); application detail Support card and the
modal show Email (mailto) and Teams chat buttons for contacts with an
SSO, derived as sso@ + a new contact_email_domain site setting
(default geaerospace.com, blank hides the buttons).

Audit log: hovering a user SSO shows the full name, resolved
best-effort from the employee directory in either mode.

Docs/hygiene from a standards review: CLAUDE.md active-state,
CONTRACT-STABILITY.md and README brought to contract 0.10.0 / 11
plugins / migration head 7d22; get_asset_panels endpoint path fixed in
the hook docstring; leftover debug console.logs removed.

781 tests pass; contacts modal, action-button hrefs, and the audit
tooltip verified live.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/assets/style.css

@@ -1320,6 +1320,24 @@ td.actions {
   font-size: 13px;
 }
 
+/* Small email/Teams action buttons for support contacts */
+.contact-action {
+  display: inline-block;
+  margin-left: 0.35rem;
+  padding: 0.05rem 0.4rem;
+  font-size: 12px;
+  line-height: 1.5;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  color: var(--link);
+  background: var(--bg);
+  text-decoration: none;
+}
+.contact-action:hover {
+  border-color: var(--primary);
+  color: var(--primary);
+}
+
 /* Feature Tags */
 .feature-tag {
   display: inline-block;