matrix: use flutterBuildFlags (string) not targetFlags for --base-href (#634 followup)

Footer was still pointing at the old canonical at
`git.berlin.ccc.de/vinzenz/hyperhive` — that's the upstream URL
from before #524 moved the public mirror to `forge.darkest.space`.
README + docs already reference the new URL; this was the only
stale frontend pointer.

README.md

@@ -116,10 +116,13 @@ lives at `/var/lib/nixos-containers/hive-matrix/`. Federation is
 enabled with an empty `trusted_servers` list; e2ee is deferred to
 a follow-up (#551).
 
-Optional: set `services.hyperhive.matrix.gui.enable = true;` to serve a
+The hive-gateway nginx container serves a
 [fluffychat-web](https://fluffychat.im) matrix client at `/matrix/`
-via the hive-gateway nginx container (see gateway option above). Disabled by default. The `◆ M4TR1X ◆ →`
-tab appears in the dashboard chrome when enabled. The web client can
+when `services.hyperhive.matrix.gui.enable` is on. This defaults to
+`services.hyperhive.matrix.enable`, so enabling the homeserver enables
+the web client by default; set `gui.enable = false` explicitly to keep
+the homeserver without the GUI. The `◆ M4TR1X ◆ →` tab appears in
+the dashboard chrome when enabled. The web client can
 connect to any Matrix homeserver; enter the URL at first visit (e.g.
 the local tuwunel instance if `services.hyperhive.matrix.enable = true`, or
 any external homeserver).

docs/web-ui.md

@@ -145,10 +145,10 @@ cross-page link (`◆ FL0W ◆ →`), not a pane swap.
   count), Y3R C4LL (pending approvals + questions), and SCH3DUL3S
   (active schedules); FL0W pill mirrors the operator inbox length
   (hidden when zero). The M4TR1X → entry is hidden when
-  `hyperhive.matrix.gui.enable = false` (default) so operators
-  without the matrix GUI on don't see a dead link — tabs.js gates
-  the `hidden` attribute on `state.matrix_gui_enabled` from
-  `/api/state` (#607).
+  `services.hyperhive.matrix.gui.enable` is off (defaults to
+  `matrix.enable`) so operators without the matrix GUI on don't
+  see a dead link — tabs.js gates the `hidden` attribute on
+  `state.matrix_gui_enabled` from `/api/state` (#607).
 - **Notification controls**: `🔔 enable notifications` when
   permission ungranted; `🔕 mute / 🔔 unmute` toggle once granted.
   Always visible in the chrome regardless of active tab.
@@ -307,21 +307,22 @@ operator has one place for everything time-fired (#460).
 
 ### M4TR1X page (`/matrix/`, optional)
 
-A static matrix web client (default `pkgs.fluffychat-web`, swappable
-via `hyperhive.matrix.gui.package`) mounted by hive-c0re's dashboard
-router as a sibling `nest_service("/matrix", ServeDir::new(dir))`
-when `hyperhive.matrix.gui.enable = true` + `HIVE_MATRIX_GUI_DIR` env
-points at the dist root. Same-origin with the dashboard; the
-operator opens `/matrix/` in the same tab from the M4TR1X → strip
-entry, logs in once with the in-host tuwunel homeserver URL
-(`http://localhost:8008` or whatever the matrix module exposes),
-then has matrix chat alongside the agent dashboard without leaving
-the host's origin.
+A static matrix web client (default `pkgs.fluffychat-web` rebuilt
+with `--base-href /matrix/`, swappable via
+`services.hyperhive.matrix.gui.package`) served by the hive-gateway
+nginx container at `/matrix/` when
+`services.hyperhive.matrix.gui.enable` is on (defaults to
+`matrix.enable`, #635). c0re signals availability via the
+`HIVE_MATRIX_GUI_ENABLED` env var → `state.matrix_gui_enabled` in
+`/api/state`; the gateway does the actual static serving.
 
-v0 same-origin shape via hive-c0re ServeDir (#607 / #610); the
-unified nginx-front re-root to `https://matrix.${hyperhive.domain}`
-+ `.well-known/matrix/client` auto-discovery is tracked in #609
-(atlas's lane, post-#15).
+The operator opens `/matrix/` from the M4TR1X → strip entry, logs
+in once with the in-host tuwunel homeserver URL
+(`http://localhost:8008` or whatever the matrix module exposes).
+
+The unified nginx-front re-root to
+`https://matrix.${hyperhive.domain}` + `.well-known/matrix/client`
+auto-discovery is tracked in #609 (atlas's lane, post-#15).
 
 ### FL0W page (`/flow.html`)
 

frontend/packages/dashboard/src/index.html

@@ -188,7 +188,7 @@
   <footer>
     <pre class="banner banner-thin">░▒▓█▓▒░ HYPERHIVE / HIVE-C0RE / WE ARE THE WIRED ░▒▓█▓▒░</pre>
     <div class="divider">══════════════════════════════════════════════════════════════</div>
-    <p>▲△▲ <a href="https://git.berlin.ccc.de/vinzenz/hyperhive">hyperhive</a> ▲△▲ hive-c0re on this host ▲△▲</p>
+    <p>▲△▲ <a href="https://forge.darkest.space/hyperhive/hyperhive">hyperhive</a> ▲△▲ hive-c0re on this host ▲△▲</p>
   </footer>
 
   <!-- Slide-in detail panel. Long content (clicked file previews,

nix/modules/hive-matrix.nix

@@ -191,16 +191,17 @@ in
           # the browser resolves relative asset paths (`Imaging.js`,
           # `flutter.js`, `splash/*`) against the document ROOT,
           # producing 404s for every asset (#634). Inject the right
-          # base-href into the build via nixpkgs's `buildFlutterApplication`
-          # targetFlags. When subdomain routing lands (#609 —
-          # `matrix.${hyperhiveDomain}`), drop this override; upstream's
-          # `/` base-href is correct at the root of a dedicated subdomain.
-          targetFlags = (old.targetFlags or [ ]) ++ [
-            "--base-href"
-            "/matrix/"
-          ];
+          # base-href into the actual `flutter build web` invocation
+          # via the upstream derivation's `flutterBuildFlags` string
+          # (the buildPhase is literally
+          # `flutter build web -v $flutterBuildFlags`). When subdomain
+          # routing lands (#609 — `matrix.${hyperhiveDomain}`), drop
+          # this override; upstream's `/` base-href is correct at the
+          # root of a dedicated subdomain.
+          flutterBuildFlags =
+            (old.flutterBuildFlags or "") + " --base-href /matrix/";
         });
-        defaultText = lib.literalMD "`pkgs.fluffychat-web` rebuilt with `--base-href /matrix/` via `targetFlags`.";
+        defaultText = lib.literalMD "`pkgs.fluffychat-web` rebuilt with `--base-href /matrix/` via `flutterBuildFlags`.";
         description = ''
           Static web client dist to serve at `/matrix/`. Defaults to
           `pkgs.fluffychat-web` rebuilt with `--base-href "/matrix/"`