fix(fips,federation,ui): mesh content browse, removed-node tombstones, modal sizing

FIPS peer content browse over the mesh was failing with "Peer returned
error: 404 Not Found" and never falling back to Tor. `is_peer_allowed_path`
only allowed `/content/<id>` (item fetches) — the catalog endpoint is
exactly `/content` (no trailing slash), so it 404'd over the FIPS peer
listener. A FIPS 404 was also treated as a successful response, so the dial
never retried Tor. Fixes: allow `/content` over the mesh; add
`fips_should_fall_back()` so a FIPS 404/5xx in Auto mode falls back to Tor
(handles version-skew peers reaching a different route). Also correct the
reconnect hint text — the public anchor is TCP/8443, not UDP/8668.

Federation: deleted nodes reappeared because transitive discovery
(`merge` of a peer's advertised trusted peers) re-added any unknown DID.
Add a tombstone store (`removed-nodes.json`): remove_node tombstones the
DID, transitive merge skips tombstoned DIDs, and a remote-triggered
peer-joined is ignored for a removed DID. Explicit local re-add (add_node)
clears the tombstone.

UI: the app credentials modal panel stretched edge-to-edge (height:100%,
max-width:none, items-stretch overlay). Constrain it to a centered card
(max-width 34rem, rounded, dimmed full-screen backdrop) matching the
AppIconGrid / wallet-receive modal.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

core/archipelago/src/api/rpc/federation/handlers.rs

@@ -533,6 +533,19 @@ impl RpcHandler {
             return Ok(serde_json::json!({ "accepted": true, "already_known": true }));
         }
 
+        // Respect operator removal: a peer the operator deleted must not
+        // silently re-join via a stale invite. The tombstone is only cleared
+        // by an explicit local action (manually adding the node or accepting
+        // an incoming invite) — not by a remote-triggered join.
+        if federation::load_removed_dids(&self.config.data_dir)
+            .await
+            .unwrap_or_default()
+            .contains(did)
+        {
+            info!(peer_did = %did, "Ignoring peer-joined for a removed (tombstoned) DID");
+            return Ok(serde_json::json!({ "accepted": false, "removed": true }));
+        }
+
         let node = FederatedNode {
             did: did.to_string(),
             pubkey: pubkey.to_string(),

core/archipelago/src/api/rpc/fips.rs

@@ -115,10 +115,12 @@ impl RpcHandler {
         } else if !after.key_present {
             "no_seed_key"
         } else if after.authenticated_peer_count == 0 {
-            // Daemon is up with a key but hasn't authenticated any
-            // peers — almost always outbound UDP/8668 dropped by the
-            // local firewall/router, or the anchor itself being down.
-            "no_outbound_udp_or_anchor_down"
+            // Daemon is up with a key but hasn't authenticated any peers —
+            // almost always the outbound connection to the anchor being
+            // dropped by the local firewall/router, or the anchor itself
+            // being down. The public anchor is reached over TCP/8443 (not
+            // UDP/8668 — that endpoint is dead).
+            "no_outbound_or_anchor_down"
         } else {
             "peers_but_no_anchor"
         };
@@ -126,8 +128,8 @@ impl RpcHandler {
             "connected" => "An anchor is reachable.",
             "daemon_down" => "The FIPS daemon didn't come back up — check the FIPS service on this host.",
             "no_seed_key" => "No seed-derived FIPS key on disk. Re-run the onboarding unlock step.",
-            "no_outbound_udp_or_anchor_down" =>
-                "Daemon is running but no peers handshook. Your router / ISP might be blocking outbound UDP 8668, or every configured anchor could be down. Add a reachable peer in Seed Anchors.",
+            "no_outbound_or_anchor_down" =>
+                "Daemon is running but no peers handshook. Your router or ISP may be blocking the outbound connection to the mesh anchor (TCP port 8443), or every configured anchor is down. The public anchor is added automatically — if it still won't connect, add another reachable peer in Seed Anchors.",
             "peers_but_no_anchor" =>
                 "Mesh has peers but none of them are anchors we recognise. Add your cluster's anchor in Seed Anchors.",
             _ => "",