Adds a breadcrumb trail to nested views for orientation. Mechanism: a
{% block breadcrumb %} slot in base.html (+ styling) and a shared crumbs()
macro in templates/_macros.html; each nested page fills the block with its
trail (root→current, last item is the current page). Pages without the block
render no bar, so top-level nav roots stay clean.
Applied to: Ansible (browse, schedules, playbook editor, run detail) +
inventory (targets/groups + detail), host_agent (fleet, host detail,
settings), hosts form, settings tabs (ansible/auth/notifications/plugins/
reports + plugin detail), dashboard (list, edit), and alerts (rule form,
maintenance + new). Dynamic labels (host/target/run/dashboard names) come
from the page context — no route changes. All 60 templates Jinja-compile.
Task #873.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Surfaces the metrics the agent now collects (task #868). Adds a viewer-facing
fleet page (/plugins/host_agent/) with per-host cards (CPU/mem/disk/load/temp,
stale flag) and a per-host detail page (/plugins/host_agent/<id>/) — the link
the fleet widget already pointed at but had no route for.
Detail page shows current gauges (CPU, memory incl. swap/cache, load, network
rx/tx, disk I/O, temp max, memory/cpu/io PSI), per-core CPU bars, per-mount
filesystem bars, and per-interface/disk/sensor breakdowns, plus history charts
(utilization %, throughput B/s, load & pressure) over a selectable range.
Charts use a linear epoch-ms x-axis so no Chart.js date adapter is needed.
Stale state uses the plugin's stale_after_seconds threshold. Repoints the
host_resources widget detail link from admin settings to the new fleet page.
Completes milestone #68 (task #867).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen