fix(web-ui): security hardening, SPA nav, and modularization
Ship the in-progress ES-module refactor of the web-ui (new static/modules/ layout, Usage/Settings pages, uplot-based dashboard) alongside a round of security and UX fixes: - main.go: add CSP + X-Frame-Options: DENY + X-Content-Type-Options: nosniff + Referrer-Policy middleware on every response; WS CheckOrigin now requires Origin host to match Host (blocks cross-site WebSocket hijacking); upgrade client before dialing upstream so origin check runs first; fatal on unparseable AGENTMON_QUERY_BASE. - app.js: delegated click handler intercepts same-origin <a> clicks for SPA navigation (prev. every nav link caused a full page reload, dropping WS + in-memory state); delegated .copy-btn[data-copy] handler replaces inline onclick=; removed window.navigate / window.copyToClipboard globals and the duplicated handleGlobalSearch. - modules/nav-signal.js: per-route AbortController so in-flight fetches are cancelled when the user navigates away, preventing stale toasts and wasted renders. - modules/api.js: honours the nav signal by default; AbortError is silent. - modules/router.js: resets the nav controller on every route; dropped the fixed 80ms transition delay; breadcrumbs no longer emit inline onclick= (delegated handler picks them up). - modules/utils.js: renderCopyButton emits data-copy=\"...\" instead of nesting a JS string inside an HTML attribute — fixes an XSS where values containing ' broke out via ' decoding. Verified: go build clean; `node --check` clean on all modified modules; manual curl probes confirm security headers present on every response and WS upgrade returns 403 for cross-origin/missing Origin while 101 for same-origin. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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William Valentin