Closing-slide cleanups, fewer presenter clicks, and a presentation/auto toggle

[OPS-PIvers]

Summary

A batch of deck refinements to "The Apps Script Playground":

• Resources slide: the dead-end "Questions later?" row now shows a real, clickable contact (mailto:paul.ivers@orono.k12.mn.us).
• Teachers section: reframed the divider + speaker note so the message is "custom web apps built for teachers," not teachers shipping their own without approval.
• Cohesion slide: removed the two QR codes (links live on the conference resources page), letting the DESIGN.md figure breathe; deleted the now-unused QR assets and dead CSS.
• New transition slide: a navy "one feel" statement before the DESIGN.md reveal, posing the question it answers.
• Fewer presenter clicks: in manual mode each cascade now reveals as a single chunk instead of one click per item (in-slide reveal clicks 78 → 30 across the deck). Auto/kiosk stagger, print, and export are unaffected.
• Presentation/auto toggle: a play/pause button in the control bar (and the A key) flips between speaker-driven and self-running reveal at runtime; not persisted, so a reload returns to the file default.

Speaker notes were kept 1:1 with slides (verified 25 slides / 25 notes).

https://claude.ai/code/session_01PTM7DrwXom2dPSWraGr299

[gemini-code-assist]

Code Review

This pull request updates the layout, content order, and text of "The Apps Script Playground" presentation. Key changes include styling adjustments to the problem slide, reordering the stack flow nodes to start with Google Sheets, swapping the first two steps of the recipe, removing the "Review before rollout" point, and replacing a generic contact name with a direct email address. The review feedback suggests wrapping the newly added email address in an anchor tag with a mailto link to make it actionable and prevent accidental slide navigation.

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