frontend: hive-warn — replace severity+pulse with info/warning/error levels

mara, PR review: "i dont like that they still have different styling.
if anything, there should be distinction between info,warning,error
(semantics). all warnings should be styled identically."

Replaces the severity ('amber'|'red') + standalone pulse boolean with
a single level ('info'|'warning'|'error') attribute -- a fixed
three-tier ladder instead of an open combination. Colours reuse
theme.css's own already-documented semantics rather than inventing new
ones: --cyan is already "info accents", --amber already "warnings",
--red already "errors, fail state". Pulse is now baked into `error`
specifically rather than a separate opt-in knob, since the one call
site that wanted attention-grabbing (an active incident) is also the
one that's semantically error -- tying the two together removes a
combination that shouldn't exist independently of the tier.

Reclassified the three call sites explicitly (no implicit default
relied on): credentials.html's GitHub PAT advisory and core.js's K3PT
ST4T3 caveat are both `level="warning"` (same as before, and now
identical to each other by construction, not by coincidence);
swarm.js's port-collision banner is `level="error"` (an active
incident needing operator action now, not a standing caveat).

npm run build clean both packages, grepped for leftover
severity/pulse references (only prose mentions describing what this
replaces).

frontend/packages/dashboard/src/credentials.html

@@ -90,7 +90,7 @@
          Security-warning banner + a link to generate a PAT. -->
     <section class="cred-pane" id="cred-pane-github" data-tab-pane="github"
              role="tabpanel" aria-labelledby="cred-tab-github" hidden>
-      <hive-warn>
+      <hive-warn level="warning">
         ⚠ use a <strong>dedicated bot account</strong>, not a human's &mdash;
         and a <strong>minimally-scoped</strong> personal access token (only
         the repos/scopes the agent actually needs, e.g. <code>repo</code> +