HUD in four groups, every control named on hover; versions wears the autosave dot; duplicate button; C = sheet, G = guides

[grunion-ai]

What changed

The HUD is four groups after the spacer, a hairline between them, and every control names itself and its key on hover.

Group	Controls	Keys
navigate	‹ ›	← →
save state	versions; the autosave dot is its badge (green the file has everything · amber saved in this browser · red nothing persists). Click opens the menu; its first row is the full save status and a Save ⌘S button, then pin · restore	⌘S
edit	+ · duplicate (new: the selected rows offset 16px and re-selected, else the slide after itself, in the sheet the selected slides) · guides + snap · spellcheck	G toggles guides
file	save a copy (shown only when storage is blocked) · PDF	none
view	contact sheet · full screen · shortcuts	C · F

• Tooltips are data-tip, instant, one CSS rule for the whole HUD. The OS title delay is gone from every HUD control. No tooltip while a menu is open.
• The versions tooltip is short (Versions · autosaved hh:mm:ss); the full sentence sits in the menu's first row and on the dot's aria-label.
• C opens the contact sheet (was G). G toggles guides + snap. ⌘P and ⌘D leave the shortcut list; the sheet's ⌘D handler is removed (the duplicate button is the door). Plain-letter keys ignore ⌘/⌃/⌥ so ⌘C stays the browser's copy.
• The ⓘ popover is three columns by what a key acts on: slides · rows · file, with one dim line naming the button-only tools.
• fileHtml resets the guides toggle through data-tip, not title.

Why

Kyle's review of the toolbar (mockup: today vs proposed A/B, picked B): tools that belong together sat apart, the autosave dot floated alone, nothing said what a button did until the OS tooltip arrived a second later, and the versions menu clipped off the right edge.

Verification

• New gate test/hud.test.mjs (5 tests: order + dividers, tooltips, dot inside versions + popover contents, C/G/tooltip/menu live, duplicate rows/slide/sheet live).
• Gate and editor assertions moved with the contract (HUD id set and order, SKILL.md manifest, spell/snap tips, versions row count, moveBy call count, popover lines).
• deck.html rebuilt from the explainer example.
• Full suite on the branch: node --test test/**/*.test.mjs → 159 pass, 0 fail, 0 skipped (Playwright live tests included).
• Eyeballed in the desktop pane: strip order, hover tooltips, the open ⓘ popover, the versions menu fitting inside the window with the Save row.

Follow-up owned by Kyle: adriany task 1943 (test the versions button with multiple versions).

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