refactor(nav): collapse fleet/device pages into one sidebar entry with internal tab strip

The sidebar had 10 entries with 5 of them (Devices, Seismographs, Sound
Level Meters, Modems, Pair Devices) all about the physical fleet plus
SFM Events as a debug surface.  Operators kept asking "where do I find
BE11529?" without knowing whether it was a seismograph / SLM / modem.

This collapses those 5+1 into a single "Fleet" sidebar entry that opens
into a unified tab strip across the top of the four device pages.  Each
page keeps its existing custom layout (seismograph-specific
calibration/deployment columns, SLM live-status panel, modem pairing
view, all-devices roster).  The strip just provides the navigation +
the "Pair Devices" button as an action.

Sidebar before (10 items):
  Dashboard · Devices · Seismographs · SFM Events · Sound Level Meters
  Modems · Pair Devices · Projects · Job Planner · Settings

Sidebar after (5 items):
  Dashboard · Fleet · Projects · Job Planner · Settings

Changes:
- templates/partials/fleet_tab_strip.html (new): the shared tab strip.
  Auto-detects the active tab from request.url.path.  4 tabs
  (Seismographs / Sound Level Meters / Modems / All Devices) plus a
  "Pair Devices" button on the right.
- templates/{seismographs,sound_level_meters,modems,roster}.html: added
  {% include 'partials/fleet_tab_strip.html' %} as the first thing
  inside the content block.  No other changes to those templates'
  existing layouts.
- templates/base.html: replaced the 6 device-related sidebar links with
  one "Fleet" link to /seismographs.  The Fleet entry is highlighted
  when the current URL is any of /seismographs, /sound-level-meters,
  /modems, /roster, /pair-devices, /unit/*, or /slm/*.
- templates/settings.html: SFM Events moved out of the main nav into a
  new "SFM Admin" card under Settings → Developer.  Daily event
  browsing already lives on project / location / unit pages (Phases
  1+2+3); the standalone /sfm page is now admin / cross-project debug
  surface only.

URLs unchanged — all bookmarks / deep links still work.  /sfm still
serves the standalone page, it's just no longer in the main nav.
Mobile bottom-nav unaffected.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

templates/base.html

@@ -109,45 +109,22 @@
                     Dashboard
                 </a>
 
-                <a href="/roster" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if request.url.path == '/roster' %}bg-gray-100 dark:bg-gray-700{% endif %}">
+                {# Fleet — single sidebar entry for all device-type pages.
-                    <svg class="w-5 h-5 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                   The tab strip on each underlying page (Seismographs /
-                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2"></path>
+                   Sound Level Meters / Modems / All Devices) handles
-                    </svg>
+                   navigation between the device-type-specific layouts.
-                    Devices
+                   Active when on any /seismographs, /sound-level-meters,
-                </a>
+                   /modems, /roster, /pair-devices, /unit/* page. #}
-
+                {% set _is_fleet = (
-                <a href="/seismographs" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if request.url.path == '/seismographs' %}bg-gray-100 dark:bg-gray-700{% endif %}">
+                    request.url.path in ('/seismographs', '/sound-level-meters', '/modems', '/roster', '/pair-devices')
+                    or request.url.path.startswith('/unit/')
+                    or request.url.path.startswith('/slm/')
+                ) %}
+                <a href="/seismographs" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if _is_fleet %}bg-gray-100 dark:bg-gray-700{% endif %}">
                     <svg class="w-5 h-5 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                         <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z"></path>
                     </svg>
-                    Seismographs
+                    Fleet
-                </a>
-                <a href="/sfm" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if request.url.path == '/sfm' %}bg-gray-100 dark:bg-gray-700{% endif %}">
-                    <svg class="w-5 h-5 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z"></path>
-                    </svg>
-                    SFM Events
-                </a>
-
-                <a href="/sound-level-meters" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if request.url.path == '/sound-level-meters' %}bg-gray-100 dark:bg-gray-700{% endif %}">
-                    <svg class="w-5 h-5 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.536 8.464a5 5 0 010 7.072m2.828-9.9a9 9 0 010 12.728M5.586 15H4a1 1 0 01-1-1v-4a1 1 0 011-1h1.586l4.707-4.707C10.923 3.663 12 4.109 12 5v14c0 .891-1.077 1.337-1.707.707L5.586 15z"></path>
-                    </svg>
-                    Sound Level Meters
-                </a>
-
-                <a href="/modems" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if request.url.path == '/modems' %}bg-gray-100 dark:bg-gray-700{% endif %}">
-                    <svg class="w-5 h-5 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8.111 16.404a5.5 5.5 0 017.778 0M12 20h.01m-7.08-7.071c3.904-3.905 10.236-3.905 14.141 0M1.394 9.393c5.857-5.857 15.355-5.857 21.213 0"></path>
-                    </svg>
-                    Modems
-                </a>
-
-                <a href="/pair-devices" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if request.url.path == '/pair-devices' %}bg-gray-100 dark:bg-gray-700{% endif %}">
-                    <svg class="w-5 h-5 mr-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1"></path>
-                    </svg>
-                    Pair Devices
                 </a>
 
                 <a href="/projects" class="flex items-center px-4 py-3 rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 {% if request.url.path.startswith('/projects') %}bg-gray-100 dark:bg-gray-700{% endif %}">

templates/modems.html

@@ -3,6 +3,7 @@
 {% block title %}Field Modems - Terra-View{% endblock %}
 
 {% block content %}
+{% include "partials/fleet_tab_strip.html" %}
 <div class="mb-8">
     <h1 class="text-3xl font-bold text-gray-900 dark:text-white flex items-center">
         <svg class="w-8 h-8 mr-3 text-seismo-orange" fill="none" stroke="currentColor" viewBox="0 0 24 24">

templates/partials/fleet_tab_strip.html

@@ -0,0 +1,54 @@
+{# Fleet tab strip.
+
+Shared header for every page under the "Fleet" sidebar section.  Each
+underlying page (/roster, /seismographs, /sound-level-meters, /modems)
+keeps its own custom layout — this partial just provides the tab
+navigation across the top so they feel like one logical area.
+
+The active tab is detected from request.url.path so deep links work.
+
+Usage at top of any Fleet-section template:
+    {% include 'partials/fleet_tab_strip.html' %}
+#}
+{% set _path = request.url.path %}
+<div class="mb-6 border-b border-gray-200 dark:border-gray-700">
+    <div class="flex items-end justify-between flex-wrap gap-3 mb-0">
+        <nav class="flex gap-1">
+            <a href="/seismographs"
+               class="px-4 py-2 -mb-px border-b-2 text-sm font-medium transition-colors {% if _path == '/seismographs' %}border-seismo-orange text-seismo-orange{% else %}border-transparent text-gray-600 dark:text-gray-400 hover:text-gray-900 dark:hover:text-white hover:border-gray-300 dark:hover:border-gray-600{% endif %}">
+                <svg class="w-4 h-4 inline -mt-0.5 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M22 12h-4l-3 9L9 3l-3 9H2"/>
+                </svg>
+                Seismographs
+            </a>
+            <a href="/sound-level-meters"
+               class="px-4 py-2 -mb-px border-b-2 text-sm font-medium transition-colors {% if _path == '/sound-level-meters' %}border-seismo-orange text-seismo-orange{% else %}border-transparent text-gray-600 dark:text-gray-400 hover:text-gray-900 dark:hover:text-white hover:border-gray-300 dark:hover:border-gray-600{% endif %}">
+                <svg class="w-4 h-4 inline -mt-0.5 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15.536 8.464a5 5 0 010 7.072M12 6v12M9 8.464a5 5 0 000 7.072"/>
+                </svg>
+                Sound Level Meters
+            </a>
+            <a href="/modems"
+               class="px-4 py-2 -mb-px border-b-2 text-sm font-medium transition-colors {% if _path == '/modems' %}border-seismo-orange text-seismo-orange{% else %}border-transparent text-gray-600 dark:text-gray-400 hover:text-gray-900 dark:hover:text-white hover:border-gray-300 dark:hover:border-gray-600{% endif %}">
+                <svg class="w-4 h-4 inline -mt-0.5 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8.111 16.404a5.5 5.5 0 017.778 0M12 20h.01m-7.08-7.071c3.904-3.905 10.236-3.905 14.141 0M1.394 9.393c5.857-5.857 15.355-5.857 21.213 0"/>
+                </svg>
+                Modems
+            </a>
+            <a href="/roster"
+               class="px-4 py-2 -mb-px border-b-2 text-sm font-medium transition-colors {% if _path == '/roster' %}border-seismo-orange text-seismo-orange{% else %}border-transparent text-gray-600 dark:text-gray-400 hover:text-gray-900 dark:hover:text-white hover:border-gray-300 dark:hover:border-gray-600{% endif %}">
+                <svg class="w-4 h-4 inline -mt-0.5 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 10h16M4 14h16M4 18h16"/>
+                </svg>
+                All Devices
+            </a>
+        </nav>
+        <a href="/pair-devices"
+           class="mb-1 inline-flex items-center gap-1.5 px-3 py-1.5 text-sm border border-gray-300 dark:border-gray-600 hover:bg-gray-50 dark:hover:bg-gray-700 text-gray-700 dark:text-gray-300 rounded-lg transition-colors">
+            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13.828 10.172a4 4 0 00-5.656 0l-4 4a4 4 0 105.656 5.656l1.102-1.101m-.758-4.899a4 4 0 005.656 0l4-4a4 4 0 00-5.656-5.656l-1.1 1.1"/>
+            </svg>
+            Pair Devices
+        </a>
+    </div>
+</div>

templates/roster.html

@@ -3,6 +3,7 @@
 {% block title %}Devices - Seismo Fleet Manager{% endblock %}
 
 {% block content %}
+{% include "partials/fleet_tab_strip.html" %}
 <div class="mb-8">
     <div class="flex justify-between items-start">
         <div>

templates/seismographs.html

@@ -3,6 +3,7 @@
 {% block title %}Seismographs - Seismo Fleet Manager{% endblock %}
 
 {% block content %}
+{% include "partials/fleet_tab_strip.html" %}
 <div class="mb-8">
     <h1 class="text-3xl font-bold text-gray-900 dark:text-white">Seismographs</h1>
     <p class="text-gray-600 dark:text-gray-400 mt-1">Manage and monitor seismograph units</p>

templates/settings.html

@@ -561,6 +561,20 @@
                     </a>
                 </div>
 
+                <!-- SFM Admin (raw event database) -->
+                <div class="flex items-center justify-between p-4 bg-gray-50 dark:bg-slate-700 rounded-lg">
+                    <div>
+                        <div class="font-medium text-gray-900 dark:text-white">SFM Admin</div>
+                        <div class="text-sm text-gray-500 dark:text-gray-400 mt-0.5">
+                            Raw event database from SFM — cross-project event search, file downloads, debug view. Day-to-day event browsing lives on project / location / unit pages.
+                        </div>
+                    </div>
+                    <a href="/sfm"
+                       class="ml-6 px-4 py-2 bg-seismo-orange hover:bg-orange-600 text-white text-sm font-medium rounded-lg transition-colors whitespace-nowrap">
+                        Open
+                    </a>
+                </div>
+
                 <!-- Metadata Backfill (Phase 5a) -->
                 <div class="flex items-center justify-between p-4 bg-gray-50 dark:bg-slate-700 rounded-lg">
                     <div>

templates/sound_level_meters.html

@@ -3,6 +3,7 @@
 {% block title %}Sound Level Meters - Seismo Fleet Manager{% endblock %}
 
 {% block content %}
+{% include "partials/fleet_tab_strip.html" %}
 <div class="mb-8">
     <h1 class="text-3xl font-bold text-gray-900 dark:text-white flex items-center">
         <svg class="w-8 h-8 mr-3 text-seismo-orange" fill="none" stroke="currentColor" viewBox="0 0 24 24">