Reveal canon text when Way rows are opened

[erinepshovel-code]

What changed

• replaces each /way/ heading link with a native <details>/<summary> disclosure
• reveals the exact generated unit.content inline when the row is tapped
• keeps separate links to the Unit page, Article Lab, and exact Source/provenance page
• preserves section, subheading, and nested-heading indentation
• adds responsive mobile styling and open/closed state labels

Root cause

The canon-derived tree rendered each row only as a navigation link. A click left the tree for a companion page, so the map itself never showed the text the row represented.

User impact

Every row now works as a one-tap reading surface, including without JavaScript. Opening a row does not change the /way/ URL. Deeper interpretation and provenance paths remain explicit rather than being collapsed into the disclosure.

Validation

• 31 repository/static tests passed
• exact-text Chromium interaction test passed
• /way/ automated accessibility check passed
• mobile disclosure render inspected at 393 × 851
• branch is one commit ahead of main, zero behind, with exactly five intended files

hmmm

The local production aggregate gate could not complete because external canon/repository/textbook requests entered fallback twice; the validator correctly rejected fallback production data. The checked-in recovery canon is also stale against current Article drafts. GitHub CI is therefore the authoritative live-source gate for this PR.