feat(client): add create/edit environment pages and hoverable cards

- add CreateEnvironmentPage and EditEnvironmentPage with pre-filled form
- add /environments/new and /environments/:id/edit routes
- add Edit option to card context menu and detail page toolbar
- move env id pill to card footer (left), timestamp stays right
- make env cards clickable (navigate to detail); cog stops propagation
- add hoverable Card variant with primary border+shadow on hover
- add link color tokens and global anchor styles for both themes
- fix Timestamp pill visibility in dark mode with border token
- add DescriptionList truncate prop with ellipsis and title tooltip
- stack DescriptionList dd below dt with 8px gap between items

client/src/ui/tokens.css

@@ -39,6 +39,9 @@
   --color-running-fg: #6B4A00;
 
   /* Text & Surface — Outer Space */
+  --color-link: #5240A8;         /* Kimberly, darkened for contrast on light bg */
+  --color-link-hover: #3D2F80;
+
   --color-text: #2D3339;
   --color-text-muted: #6650C0;   /* Kimberly */
   --color-border: #AFBFB9;       /* Powder Ash */
@@ -91,6 +94,16 @@ body {
   margin: 0;
 }
 
+a {
+  color: var(--color-link);
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}
+
+a:hover {
+  color: var(--color-link-hover);
+}
+
 /* ── Dark theme ─────────────────────────────────────────────────────────── */
 [data-theme="dark"] {
   /* Primary — Atlantis unchanged, pops well on dark */
@@ -126,6 +139,9 @@ body {
   --color-running-fg: #F0D060;
 
   /* Text & Surface */
+  --color-link: #B0AAD6;         /* lightened Kimberly, readable on dark bg */
+  --color-link-hover: #CCC8E8;
+
   --color-text: #E2EAE6;
   --color-text-muted: #A9A3C9;  /* lightened Kimberly */
   --color-border: #3D4850;