FleetHealth PR 3: 'Projects' panel — which repos live where

Backend:
* New DashboardProject { repo, cache_bytes, fingerprint_count,
  refs, first_seen_unix, last_seen_unix, tier }.
* Handler build_projects() joins ref-tracking with the ref-store
  and blob-store: for each recorded fp, resolve fp → blob-id via
  RefStore::{get_stamped, get} then sum blob sizes per repo.
* Tier is a wall-clock function of last_seen_unix:
    active < 24h, recent < 7d, else idle.
* DashboardStorageReply gains `projects: Vec<DashboardProject>`
  (serde-default so older clients still parse).

Aggregator:
* New /api/v2/projects endpoint. Fans out DashboardStorage to
  every peer, tags each project row with its originating node,
  returns hottest-first.

Frontend:
* New ProjectsPanel component appended to the FleetHealth
  landing. Groups by repo, one row per project with tier badge
  (active/recent/idle), per-node pill badges, cache-size sum,
  ref list, last-activity age.
* Empty state explains how to populate: claw-cargo build with
  --repo + --git-ref (or CLAWSTOR_REPO/CLAWSTOR_GIT_REF env
  vars in CI).

Data populates automatically as each cache-put runs. Existing
demo entry on tank (clawverse/clawstor · main · c384a4...) will
surface after redeploy.

dashboard-v2/src/lib/api.js

@@ -23,10 +23,9 @@ async function get(path) {
     }
     return resp.json();
 }
-// All paths are relative to API_BASE. E.g. '/v2/fleet' becomes
-// '/api/v2/fleet' locally or '/clawstor/api/v2/fleet' via Tailscale.
 export const api = {
     fleet: () => get('/v2/fleet'),
+    projects: () => get('/v2/projects'),
     nodeStatus: (name) => get(`/v2/node/${name}/status`),
     blobs: (limit = 200, offset = 0) => get(`/v2/storage/blobs?limit=${limit}&offset=${offset}`),
     tags: (prefix = '') => get(`/v2/storage/tags?prefix=${encodeURIComponent(prefix)}`),

dashboard-v2/src/lib/api.ts

@@ -121,8 +121,20 @@ async function get<T>(path: string): Promise<T> {
 
 // All paths are relative to API_BASE. E.g. '/v2/fleet' becomes
 // '/api/v2/fleet' locally or '/clawstor/api/v2/fleet' via Tailscale.
+export interface ProjectRow {
+  node: string;
+  repo: string;
+  cache_bytes: number;
+  fingerprint_count: number;
+  refs: string[];
+  first_seen_unix: number;
+  last_seen_unix: number;
+  tier: 'active' | 'recent' | 'idle' | string;
+}
+
 export const api = {
   fleet: () => get<FleetSnapshot>('/v2/fleet'),
+  projects: () => get<ProjectRow[]>('/v2/projects'),
   nodeStatus: (name: string) => get<NodeStatusV2>(`/v2/node/${name}/status`),
   blobs: (limit = 200, offset = 0) =>
     get<BlobSummary[]>(`/v2/storage/blobs?limit=${limit}&offset=${offset}`),