[falbany]

Closes #101
Closes #105

One PR for both follow-ups to the YAML config editor (#95), continuing the stacked editor-fix series (#106-#108).

Issue #101 — header consolidation + load config inside the editor

• Every action lives in the header bar: New / Test / Revert / Save / Save As / Apply (primary) + "Open in OS" + ✕. The standalone editor-toolbar row is gone — no second chrome band.
• "Load config file…" button in the header (new onLoadConfig prop) raises the existing LoadConfigModal from inside the editor:
  • ConfigEditorModal is rendered before the picker in App.tsx, so the picker (same --z-modal scale) paints on top while the editor stays mounted.
  • LoadConfigModal.onLoaded bumps a new editorReloadKey, passed as reloadKey — the editor re-runs its load-on-open fetch and swaps to the freshly picked file (no stale text).
• StatusBar: "Load config…" button removed, onLoadConfig + activeConfigName props removed; "Config" still opens the editor.
• Consistency cleanup: FileListTable's picker-raising prop renamed onOpenConfig → onLoadConfig, so the same name means the same thing everywhere.
• Ctrl/Cmd+S behavior unchanged (Save on disk-anchored configs, Apply fallback for session trials — covered by existing tests).

Issue #105 — footer status bar + Problems panel

• Footer status bar (thin, always visible while the editor is ready):
  • Left: validity chip — Valid (success) / n issues (danger) / Validating… (spinner) / Not validated — clicking toggles the Problems panel; ● Unsaved changes dot (role="status", moved from the old toolbar chip); action-outcome message (editor-status, aria-live="polite").
  • Right: Ln x, Col y (tracked from the editor's update listener), YAML, filename.
• Right Problems panel (~280px, collapsible, VSCode-style): severity icons (error/warning/info) on keyboard-focusable rows, close button, aria-live="polite". Auto-opens on validation failure — Test action, the save compliance gate, and 400 validation-list rejections; resets on modal close/reopen; closes on edit together with the rest of the stale feedback (fix(editor): stale Test/validation feedback must clear as soon as the user edits #102 semantics).
• Old inline banner + issue-list block removed — the footer/panel is the only feedback surface. The compliance-gate ConfirmDialog is unchanged.
• Layout: panel sits beside the editor card inside the padded body region (editor shrinks via flex); status bar below the card.

Tests

• New suites: header consolidation (all actions in header, toolbar gone, onLoadConfig wiring, reloadKey reload) and status bar/panel (chip states, cursor tracking, auto-open, toggle/close, unsaved dot, footer status, session reset).
• Existing suites updated where the filename now renders in both header and footer.
• Full suite: 241 passed (14 files); tsc -b clean; dist rebuilt.