UX redesign V09: replace shell, split Program/Console/Settings

Implements the V09 mock end-to-end (per plans/2026-04-30_ux_redesign.md):

Top shell
- index.pug rebuilt around .app-shell with a slim 96px header.
- Underline-ribbon tab bar (Control / Program / Console / Settings)
  replaces the old side menu and the inline #tab1..#tab4 system.
- Single 'All systems' pill collapses the legacy WiFi/Camera/Rotary/
  IP/Version chip-soup into one popover (sys-popover) anchored to the
  header; rotary toggle, camera feed and shutdown live there.
- Octagonal 88x88px STOP button wraps the existing <estop> SVG; STATE
  pill with pulse-dot honors prefers-reduced-motion.

Routing
- app.js parse_hash maps every existing hash:
    #control                       -> Control
    #program / #program:auto       -> Program
    #console / #console:mdi|messages|indicators -> Console
    #settings, #admin-general,
    #admin-network, #motor:N, #tool, #io, #macros, #help,
    #cheat-sheet                  -> Settings (rail picks inner)
- All deep links are preserved.

Control panel (control-view.pug + .js)
- 720px jog grid + 4-axis DRO + 4 KPI cards + 8-macro row.
- Jog tiles use V09 flat slate (#3f4b63) with diagonal helpers and
  a ghost row for XY/Z origin shortcuts.
- Per-axis Settings/Set-zero/Home buttons grow to 72x72px.
- Status strip cards: State / Velocity-Feed / Spindle / Job. Tapping
  the Spindle card opens the new override-drawer with feed + spindle
  range inputs (resolved decision in plans/...).
- Macro row binds to state.macros.slice(0, 8); >8 lives in Settings.
- Drops the old <table> control-buttons, .info, .override and .tabs
  blocks entirely.

Program panel (program-view.pug + .js)
- Extracts the Auto bar, file selectors, gcode-viewer and path-viewer
  out of control-view.
- Action buttons (RUN/STOP/UPLOAD-FOLDER/UPLOAD-FILE/DOWNLOAD-FILE/
  DELETE) at 84px with explicit color affordances.
- Reuses control-view's existing methods via the new program-mixin.

Console panel (console-view.pug + .js)
- Three sub-tabs: MDI / Messages / Indicators. Sub-tab persists in the
  URL fragment (#console:messages etc.).
- MDI: terminal-style prompt + SEND, plus an 8-wide on-screen keypad
  (G0/G1/G2/G3/G28/G92/M3/M5 + axis letters + CLEAR/SEND).
- Messages: pulls from .messages_log (mirrored from
  state.messages); badge in the header tab counts unread.
- Indicators: mounts the existing <indicators> component.

Settings shell (settings-shell.pug + .js)
- New left rail navigator listing Display, Network, General/Firmware,
  Spindle&Tool, IO, Motors 0..3, Macros, Cheat Sheet, Help.
- Inner area mounts the existing settings family templates via an
  explicit v-if cascade (avoiding a Vue 1 :is reactivity quirk).
- Shutdown / Save buttons relocated from the dropped side menu.

JS plumbing
- main.js: Vue.config.async = false to keep dependent watchers in
  sync when reactive data is mutated outside Vue's normal event loop
  (e.g. from a hashchange listener).
- program-mixin.js extracted so control-view.js no longer carries the
  file/macro/gcode methods that are now Program-only.
- control-view.js trimmed to jog/DRO/probe/home logic.
- console-view.js / settings-shell-view.js use a hashchange listener
  + local data props because Vue 1 cannot reliably observe
  .sub_tab from a child component.

Stylus rewrite
- Removes the old .header (140px), .nav-header, .brand subtree, #menu,
  #main, .control-view block, .info, .override, .toolbar, .macros-div,
  .macros-button, the .tabs > input radio-tab system and the .control-
  view #control media-query overrides. None of these are referenced
  any more.
- Adds V09 tokens (jog/macro palette + accent + line/card colors) at
  the top, the new shell rules, .ktab / .sys-btn / .state-badge /
  .estop chrome, the .control-page grid, status strip + override
  drawer, .program-page action / file bars and program body,
  .console-page MDI keypad / messages / indicators panes, and the
  .settings-shell rail.
- Adds a 1820px breakpoint that stacks the right column under the jog
  on smaller portable monitors.

Hard cut: no config.ui.layout flag, the old shell is removed in this
single commit. side-menu.css is no longer included from index.pug.

Tested locally with agent-browser (1920x1080) on every top tab and
every settings sub-route; routing, active tab highlighting and inner
view selection all work without a controller connection.

src/pug/templates/console-view.pug

@@ -0,0 +1,67 @@
+script#console-view-template(type="text/x-template")
+  .console-page
+    .console-card
+      .ptab-bar
+        button.ptab(:class="{active: sub === 'mdi'}", @click="select_sub('mdi')")
+          .fa.fa-keyboard
+          |  MDI
+        button.ptab(:class="{active: sub === 'messages'}", @click="select_sub('messages')")
+          .fa.fa-comment-dots
+          |  Messages
+          span.ptab-badge(v-if="unread_messages") {{unread_messages}}
+        button.ptab(:class="{active: sub === 'indicators'}", @click="select_sub('indicators')")
+          .fa.fa-bell
+          |  Indicators
+
+      // ----- MDI -----
+      .mdi-pane(v-show="sub === 'mdi'")
+        .mdi-input
+          span.prompt G>
+          input(type="text", v-model="mdi", :disabled="!can_mdi",
+            @keyup.enter="submit_mdi", placeholder="enter a G-code command…")
+          button.mdi-send(:disabled="!can_mdi || !mdi", @click="submit_mdi")
+            .fa.fa-paper-plane
+            |  SEND
+        .mdi-keys
+          button.mkey(@click="prepend('G0 ')") G0
+          button.mkey(@click="prepend('G1 ')") G1
+          button.mkey(@click="prepend('G2 ')") G2
+          button.mkey(@click="prepend('G3 ')") G3
+          button.mkey(@click="prepend('G28 ')") G28
+          button.mkey(@click="prepend('G92 ')") G92
+          button.mkey(@click="prepend('M3 ')") M3
+          button.mkey(@click="prepend('M5 ')") M5
+          button.mkey(@click="append('X')") X
+          button.mkey(@click="append('Y')") Y
+          button.mkey(@click="append('Z')") Z
+          button.mkey(@click="append('W')") W
+          button.mkey(@click="append('F')") F
+          button.mkey(@click="append('S')") S
+          button.mkey.clear(@click="mdi = ''") CLEAR
+          button.mkey.send(:disabled="!can_mdi || !mdi", @click="submit_mdi") SEND ↵
+
+        em Machine units: #[strong {{mach_units}}]. G20/G21 to switch.
+
+        .mdi-history(:class="{placeholder: !history.length}")
+          span.mdi-empty(v-if="!history.length") MDI history will display here.
+          .h-row(v-for="item in history", @click="load_history($index)",
+            track-by="$index")
+            span.h-cmd {{item}}
+            span.h-status ↻
+
+      // ----- Messages -----
+      .messages-pane(v-show="sub === 'messages'")
+        .msg-empty(v-if="!$root.messages_log.length")
+          .fa.fa-check-circle
+          |  No messages.
+        .msg(v-for="m in $root.messages_log",
+          :class="m.level === 'warning' ? 'warn' : 'info'", track-by="$index")
+          .mi
+            .fa(:class="m.level === 'warning' ? 'fa-triangle-exclamation' : 'fa-circle-info'")
+          div
+            .mtitle {{m.text}}
+            .mtime ID {{m.id}}
+
+      // ----- Indicators -----
+      .indicators-pane(v-show="sub === 'indicators'")
+        indicators(:state="state", :template="template")