ux(sql-workspace): editor and results framed alike, no glow, one place for the row count (#1558, stage 1, part 2)

[ZhuchkaTriplesix]

Refs #1558 (stage 1, second PR; after #1727).

Surfaces. The editor was a rounded card with an accent glow (blurRadius: 28), the toolbar a flat strip, the results nothing at all.

• SqlEditorChrome is one framed card now: radius 14, a 1 px border, no glow. The border takes the accent only while the editor has the keyboard (showFocus).
• The results sit in the same card (SqlEditorChrome(background: workbench.surface, showFocus: false)) with the 12 px inset the editor has, around the plan strip, the plan tree and the results tab alike.
• The dialogs' inline SQL fields (inlineFieldDecoration) are unchanged; they are a different component.

One place for the row count. The mode bar printed 12 row(s). and the status bar 12 rows, 8 cols.

• The mode bar now leaves a plain N row(s). to the status bar. It keeps what the status bar has not got: a truncation note, Rows affected, a script's outcome, a status with an edit hint, and the filtered count (3 of 12 rows). Without any status line (the table browser) it shows the count as before.
• The status bar says 1 row, 1 col instead of 1 rows.
• The elapsed time stays in both: the status bar's is the last run anywhere, the bar's belongs to the shown tab. I did not merge them; say if you want it gone from one.

Tests: sql_editor_chrome_test (no shadow, accent border only while focused, a card with showFocus: false keeps its border and takes its background), results_tab_test (the bar for a plain count, a truncation note, a count with a hint, no status line, affected rows), querya_status_bar_test (singular). Main-screen, workspace, e2e and guard suites pass locally (723).

Not checked on screen this time: I could not drive the running app (the window sat beside another one and my pointer input did not land), so this PR has no screenshots; the before/after pair for dark and light comes with the end of stage 1. Not in this PR: stage 2 (control rows).