cardtile editor: no engineering words; empty picture one row; press feedback; thin scrollbars

[cverorg]

Owner's ruler for the sandbox, rules 3 (no engineering words) and 6 (empty is never blank; a press answers).

• w2/banned-words.mjs + w2/words.test.mjs: the banned list (sandbox, practice mode, preview-as-verb, srcdoc, iframe, parameters/raw/params, render, deploy, publish, "markdown mode") with per-locale patterns, scanned across every catalogue the editor uses in nine locales; a control plants words and proves the scan fires. First run: 92 hits, all fixed. Banner is now "You're trying Card — nothing is saved until you make it yours." / 「你正在試玩 Card。按下「把這張變成真的」之前，什麼都不會儲存。」 (the zh names the real button; 「——」 is banned in zh by an existing test). "Raw parameters" is gone from the w2 sheets (the Markdown view already shows the whole file); the old w/ editor's block reads "Advanced".
• Empty picture tile: one grid row tall, same 18px radius and dashed outline as the empty link, a picture glyph beside the label; edit-only CSS emitted only under ctx.editIndex, so live cards never carry it. tile-geometry rule 2 now says an empty state may differ in height when the filled height comes from the picture; a test pins the row layout.
• Press transform on every shell button (audited by a test over index.html's button classes) and on the in-card add button and drawer chip.
• Thin translucent scrollbars on the shell's scrolling panes and the board document.

Verified on the preview Worker: tile-geometry ruler green on a real card; first-link ruler green (5 taps, link on the card at 2.3s); WebKit screenshots. Tests 261/261.