Article editor toolbar: toggling fences/links, class pickers, sizes, Tab indent

- Image insert always adds an empty "" caption with the cursor inside.
- Fenced blocks (``` code, ::: aside) share one toggle: clicked inside
  one it is removed and the content selected; otherwise the selection
  (expanded to whole lines) is wrapped, cursor left on the opener line.
- Code button: inline wrap toggles (selection preserved, backtick runs),
  line-spanning selections make fenced blocks.
- Link button toggles: clicked inside [label](url) it unwraps.
- Block classes via two pickers (placement, AA size) with current-class
  indication and a "normal" reset; placement replaces ::: container
  names, fences get their own attribute line.
- New .small/.large/.huge text-size classes (0.7/1.5/3em); base body is
  exactly 1rem so the scale is uniform.
- .left/.right floats generalized from figures to any block.
- Toolbar polish: non-emoji glyphs, scaled-up symbols, borderless
  hover/active states, reordered (B/i and size last).
- Editor panel no longer closes on Escape.
- CodeMirror editors capture Tab/Shift-Tab for indent/dedent.

docs/editing.md

@@ -6,12 +6,12 @@ The Vue editor is a single tabbed `EditorShell.vue` mounted in a host div create
 
 The shell hosts four kept-alive tabs (ordered site-wide first — site, structure — then, after a visual break, the per-page tabs — article, banner):
 
-- `PageEditor.vue` — CodeMirror + server-rendered preview over WebSocket `/_api/ws/editor`, previewing into the visible article; editor and article scrolls are linked piecewise-linearly, keyed on the section anchors' `data-line` (markdown source line the backend stamps on top-level anchored h1/h2s): the page follows the cursor (fractional, wrap-aware, anchored at a fixed window height), the editor follows page scroll with a progress-based viewport anchor, applied instantly (the window keeps scrolling normally while any editor is open — the panel is fixed to the viewport's left edge, its top tracking the banner's bottom edge until the banner scrolls away — and the panel scrolls internally); anchored h2s carry their own edit pens that open the editor scrolled to that section; a format bar offers Markdown helpers — bold/italic/code/link/table/image upload, with Ctrl/Cmd-B/I/S bindings — for the hard-to-remember syntax. Edits content and title only, never the path.
+- `PageEditor.vue` — CodeMirror + server-rendered preview over WebSocket `/_api/ws/editor`, previewing into the visible article; editor and article scrolls are linked piecewise-linearly, keyed on the section anchors' `data-line` (markdown source line the backend stamps on top-level anchored h1/h2s): the page follows the cursor (fractional, wrap-aware, anchored at a fixed window height), the editor follows page scroll with a progress-based viewport anchor, applied instantly (the window keeps scrolling normally while any editor is open — the panel is fixed to the viewport's left edge, its top tracking the banner's bottom edge until the banner scrolls away — and the panel scrolls internally); anchored h2s carry their own edit pens that open the editor scrolled to that section; a format bar offers Markdown helpers — bold/italic/code/link/table/image upload (always with an empty `""` caption, cursor inside the quotes), toggling fences (` ``` ` code blocks and `::: aside` containers share the same machinery: clicked inside one they remove it and select the content, otherwise they wrap the selection or the cursor's line, keeping it selected), and `.left`/`.right`/`.wide`/`.margin` placement toggles plus `.small`/`.large`/`.huge` text-size toggles (brace attributes on the block at the cursor, mutually exclusive within each group; on `:::` containers a placement class replaces the container name instead — `::: aside` → `::: margin`), with Ctrl/Cmd-B/I/S bindings — for the hard-to-remember syntax. Edits content and title only, never the path.
 - `BannerEditor.vue` — per-page banner HTML + banner design selector, previewed into `#page-banner`.
 - `SiteEditor.vue` — site brand + optional custom brand HTML with image/video upload + theme selector + page-transition selector + font picker + favicon upload — clicking the preview tile picks a new one — + site-wide custom CSS, CSS injected into `<head id="pagerite-user">`.
 - `StructureEditor.vue` — the vue-draggable structure tree with always-editable title/slug inputs per row.
 
-Media uploads everywhere use the image icon buttons (pasting into the editor works too). The article, banner and site-settings pens are shorthands that open the shell on the matching tab; once open, clicking a pen switches tabs (and retargets the editors to the current page) instead of closing/remounting. The close button in the tab bar closes the shell (Escape too); tabs have no close buttons of their own. Closing only HIDES the shell — the Vue app stays mounted, so page-editor state (unsaved text included) survives until a real page reload; the editor always follows the URL, so fetch-navigating with the shell open (or before re-opening it) retargets it to the new page — unsaved text is stashed per path for the session and restored when returning, cleared on save. Saving there is explicit (Ctrl+S) and refreshes the page regions in place. Admin panels never reload the page.
+Media uploads everywhere use the image icon buttons (pasting into the editor works too). The article, banner and site-settings pens are shorthands that open the shell on the matching tab; once open, clicking a pen switches tabs (and retargets the editors to the current page) instead of closing/remounting. The close button in the tab bar closes the shell (deliberately NOT Escape — it fired too easily by accident); tabs have no close buttons of their own. Closing only HIDES the shell — the Vue app stays mounted, so page-editor state (unsaved text included) survives until a real page reload; the editor always follows the URL, so fetch-navigating with the shell open (or before re-opening it) retargets it to the new page — unsaved text is stashed per path for the session and restored when returning, cleared on save. Saving there is explicit (Ctrl+S) and refreshes the page regions in place. Admin panels never reload the page.
 
 In-place page re-rendering shared by the banner/site/structure tabs lives in `swapdoc.js` (`runScripts`/`loadPlain`: fetch a page, swap the dynamic regions, replaceState). It also exports `dropPageCache`, which the editor tabs call after any save that can alter the rendered HTML of other pages (theme, headings, structure, banners, site brand/CSS, favicon). Dropping the cache while editing avoids re-fetching every page immediately; the public runtime re-preloads visible links once the editor panel closes.