Add system-fragment.php — a thin authenticated endpoint that returns only
the tab-panel HTML (toolbar + meta + log/nginx-config output) for a given
?tab=&n= combination. No page shell, no status section, no DB queries.
system.php changes:
- Tab <a> elements gain data-tab= attributes used by JS to identify the
target without parsing hrefs.
- Tab panel content wrapped in <div id=sys-tab-panel data-tab= data-n=>
which JS uses as both the swap target and its own state store.
- JS rewritten: tab clicks and lines-select changes call loadPanel()
which fetch()es system-fragment.php, swaps innerHTML, updates active
tab ARIA attributes, and pushes state via history.pushState.
- Browser back/forward handled via popstate listener.
- bindPanelControls() re-wires the lines-select and copy-to-clipboard
button after every innerHTML swap (event delegation not feasible here
because log-output is replaced wholesale).
- fetch() failure falls back to window.location.href (full page load).
- Tabs without JS still work: <a href> links go to system.php?tab=…
as before.
system-fragment.php:
- Requires AdminAuth::isAuthenticated(); returns 403 on failure.
- Validates tab and n params against the same whitelist as system.php.
- All helper functions namespaced with frag_ prefix to avoid redeclaration
if PHP ever includes both files in the same process.
- Renders identical HTML to the corresponding section in system.php.
system.css:
- #sys-tab-panel gets min-height:8rem and position:relative to prevent
layout jump during fetch.
- .sys-panel-loading: opacity 0.4 + pointer-events:none + subtle
diagonal-stripe ::after overlay with shimmer animation.
Status (services, PHP env, disk) is now always visible above the log/config
tab bar rather than being one of the tab targets:
- Status section rendered unconditionally above <nav class="sys-tabs">.
- Services grid, PHP info grid and disk bar grouped inside a collapsible
<section> with a header row containing the cache-freshness badge and a
toggle button (▲ Réduire / ▼ Développer).
- Collapse state persisted in localStorage so the preference survives
page reloads (e.g. when switching log tabs).
- Tab bar now only contains the three log tabs + nginx config; the 'Statut'
tab is removed. Legacy ?tab=status URLs fall through to nginx_access.
- PHP/disk sub-sections laid out in a 2-col grid inside the status panel;
responsive single-col below 700px.
- system.css: new .sys-status-section / .sys-status-header /
.sys-status-toggle / .sys-status-meta rules added.
- aria-current="page" added to active tab links.
- todo/03-system-cache.md: all items marked done; notes added explaining
why log caching was deliberately omitted.
