v3 Designer: fix toolbar reflow breaking Reset + editable Settings (v0.13)

[mbreiser]

Fixes two issues found in manual testing.

1. Toolbar reflow broke Reset after an edit (root cause of the "Reset doesn't work" + "create-anchor then Reset both fail" reports)

The ● edited dirty badge lived in the right-aligned action-button cluster and toggled display: none → inline-block. On the first edit, it appeared and shoved Undo / Redo / Reset ~83px to the left (the cluster is right-aligned via a flex spacer). A click on Reset right after editing — e.g. right after creating an anchor — then landed on empty space.

Both Reset and create-anchor always worked; the clicks were missing the shifted-away buttons. Confirmed with real clicks via the browser extension, and measured: badge toggle shifted Reset by 83px → now 0px.

Fix: move the badge to the LEFT cluster (before the flex spacer) so the spacer absorbs its width and the action buttons never move.

2. Settings drawer made editable

• Experiment Info (name, date_created, author, pattern_library) → editable text fields (docSet on ['experiment_info', k]; blank clears via docDelete).
• Rig path → editable text field + a Browse… helper that fills in the picked filename while preserving the directory prefix. (Browsers can't read full filesystem paths, so the rig path is ultimately text — the picker is a convenience.)
• Plugins stay read-only. Per the v3 spec the protocol's plugins: list is self-contained, and the rig is a separate file MATLAB loads which the web tool can't read off disk — so there's no rig→plugin inheritance available in-tool (that'd be a cross-file feature like D4).

Testing

• npm test → 467/467 (HTML-only change; JS/tests untouched).
• Node: docSet on experiment_info + rig round-trips through export.
• In-browser (real clicks): edited name + rig flow into the export; Reset works after an edit (badge no longer shifts it); create-anchor binds a field to a new anchor.

Footer v0.12 → v0.13.

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