🍕 feat(copy): inline 'Copied' feedback + always-https URLs

[jjpaulino]

Two related polish items on the panel's copy actions.

1. Every copy button now shows co-located confirmation

The toast at the bottom of the panel was easy to miss when the user's eyes were on the button they just clicked. Now the button itself swaps its icon to a checkmark and tints green for ~1.5s so confirmation is visible exactly where the click happened.

The toast still fires too — they cover different misses:

• Toast for keyboard-shortcut copies and now-collapsed menus
• Inline for focused button copies

Centralized in a new `useCopyAction(durationMs?)` hook that wraps `copyToClipboard` + `pushToast` + tracks the most-recently-used key, so multi-button consumers (Copy as…, Export, Share menu) can give per-button feedback.

```tsx
const { copy, copiedKey } = useCopyAction();
<button
className={`cs-link ${copiedKey === 'curl' ? 'cs-link-copied' : ''}`}
onClick={() => copy(curlText, 'cURL command', 'curl')}

{copiedKey === 'curl' ? <><Icon name="check" /> Copied</> : 'cURL'}

```

2. URL-flavored copies always carry a protocol

The Page URI / Component URI rows + the Copy as → URI button + the yp / yc keyboard shortcuts used to copy bare strings like `example.com/_components/x/instances/y`, which aren't paste-able into a browser, curl, or chat tool.

New `ensureProtocol()` helper in `clay-uri.ts`:

• Prepends `https://` when no scheme is present.
• Preserves an existing `http://` to avoid silently upgrading `http://localhost:3001\` dev servers.
• Collapses leading `//` for protocol-relative inputs.
• Returns empty string for nullish / whitespace-only input.

The displayed text in the row stays clean (no scheme); only the clipboard payload is normalized. The `CopyableUri` tooltip now surfaces the exact URL form so power users can verify before pasting.

Surfaces touched

Surface	Inline feedback	Protocol normalization
CopyableUri (Page URI / Component URI rows)	icon swap + green tint	yes
ComponentDetails Copy as… row	per-button keyed	URI button: yes; cURL/fetch/CSS already used `buildUrl`
JsonPreview header copy	icon swap	n/a (copies JSON)
SeoTab JSON-LD card copy	per-card icon swap	n/a (copies JSON)
ExportMenu	inline + menu held 900ms before auto-close	n/a
ShareMenu (main + cross-env)	per-button keyed; menu held 900ms	n/a (uses `buildShareLink` over `location.href`)
Keyboard shortcuts yp / yc	n/a (toast only)	yes

Tests

6 new `ensureProtocol()` cases covering:

• Bare URI → prepends `https://`
• Existing `https://` preserved
• Existing `http://` preserved (no silent upgrade)
• Protocol-relative `//host` → `https://host\`
• Nullish / whitespace input → empty string
• Surrounding whitespace trimmed

113 → 119 tests passing.

Visual additions

• New `check` glyph in the Icon set.
• `cs-link-copied`, `cs-icon-btn-copied`, `cs-uri-row-copy-copied`, `cs-export-item-copied` modifier classes — all use the success token (`--cs-success`) so they auto-adapt to light/dark themes.

Test plan

• `npm run validate` (typecheck + lint + format + 119 tests)
• `npm run build` clean
• Click Copy URI on a component → button icon flips to a green checkmark, toast says "Component URI copied", paste reveals `https://...` (not bare host)
• Same for the Page URI row
• Copy as → cURL / fetch / CSS / URI — only the clicked button flashes "Copied"
• Export menu → click Copy as JSON → item turns green and reads "Copied" for ~900ms, then menu collapses
• Share menu (with site-host mappings configured) → cross-env item shows "Copied" before menu collapses; main Share button shows inline "Copied" too
• JSON tab header copy icon → swaps to checkmark
• SEO tab → expand a JSON-LD card → copy icon → swaps to checkmark; card stays open
• Press yp / yc → clipboard payload starts with `https://`

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