fix(web): close a run at the line end and count columns correctly

Eight findings, each terminal case verified in a real terminal first:

`\x1b[32mdone\rok\x1b[0m` then `plain` shows `okne` green and `plain` in the
DEFAULT color. The replay returned the last written cell's state, so a reset
landing after the final write vanished from both the text and the returned
state — and every build tool writes exactly that shape, so the color leaked
onto all later output. The replay now converges to the state the scan ended
in, which is also what it hands to the next line.

`abcd\b\x1b[1K|` shows `   |`: CSI 1K erases THROUGH the cursor column, and
the loop stopped before it. The erase mode also reads only the first
parameter now, since a terminal treats `1;2K` exactly as `1K`.

`éx\rYZ` shows `YZ`: a combining mark takes no column, so it attaches
to the cell already written instead of advancing the cursor and leaving the
`x` standing.

`中x\rA` shows `A x`: overwriting a wide character's lead cell leaves its
spacer as a blank rather than closing the gap, which would shift everything
after it one column left.

The banner lost its span when the gutter became padding — a plain block child
only reaches the content box, so the reserved column was painted in the body
color and the card's top-left radius drawn in it. Invisible in the light
theme, where banner and body share a token; visible in the dark one. The
header now pulls back across the gutter and re-insets by the same amount.

The replay trigger matches the same CSI shape the parser accepts, so a form
like `\x1b[1;2K` can no longer skip its own erase, and `replayLine`'s JSDoc
documents its new parameter and returned pair.

Docs: four places still described the dot as sitting left of the card surface,
which stopped being true when the gutter became the card's own padding, and
two fixture comments still referenced the exit marker that was deliberately
removed.

packages/client/ui-primitives/tests/ansi.spec.ts

@@ -293,6 +293,47 @@ describe('parseAnsiLines: erase and column arithmetic', () => {
   })
 })
 
+describe('parseAnsiLines: line-end state and column widths', () => {
+  it('closes a run whose reset lands after the last written cell', () => {
+    // Verified in a real terminal: `\x1b[32mdone\rok\x1b[0m` then `plain` shows
+    // `okne` GREEN and `plain` in the DEFAULT color. The reset changes no cell,
+    // so returning the last cell's state leaked green onto every later line —
+    // and this exact shape (`\r\x1b[K\x1b[32m✓ built\x1b[0m`) is what every
+    // build tool writes.
+    expect(parseAnsiLines(`${ESC}[32mdone\rok${ESC}[0m\nplain`)).toEqual([
+      [{ text: 'okne', style: { color: 'var(--dsw-alias-state-success-primary)' } }],
+      [{ text: 'plain', style: undefined }],
+    ])
+  })
+
+  it('erases through the cursor column for 1K, not up to it', () => {
+    // Verified in a real terminal: `abcd\b\x1b[1K|` shows `   |` — the `d` under
+    // the cursor is erased too, which the CSI spec calls inclusive.
+    expect(onlySpan(`abcd${BS}${ESC}[1K|`)).toEqual({ text: '   |', style: undefined })
+  })
+
+  it('gives a combining mark no column of its own', () => {
+    // Verified in a real terminal: `é` (e + U+0301) then `x`, redrawn with `YZ`,
+    // shows `YZ`. Counting the mark as a column left the `x` standing.
+    expect(onlySpan('e\u0301x\rYZ')).toEqual({ text: 'YZ', style: undefined })
+  })
+
+  it('blanks a wide character\'s spacer once its lead cell is overwritten', () => {
+    // Verified in a real terminal: `中x` redrawn with `A` shows `A x` — the wide
+    // glyph's second cell becomes a blank rather than closing the gap, so the
+    // `x` keeps column 3.
+    expect(onlySpan('中x\rA')).toEqual({ text: 'A x', style: undefined })
+    // Covering both of its columns leaves no spacer behind.
+    expect(onlySpan('中x\rab')).toEqual({ text: 'abx', style: undefined })
+  })
+
+  it('replays an erase whose parameters carry a semicolon', () => {
+    // The replay guard has to match the same CSI shape the parser accepts, or a
+    // form like `\x1b[1;2K` skips the replay and its erase never happens.
+    expect(onlySpan(`abcd${ESC}[1;2K|`)).toEqual({ text: '    |', style: undefined })
+  })
+})
+
 describe('parseAnsiLines: SGR across lines', () => {
   it('carries active state past a newline, as a terminal does', () => {
     // Verified in a real terminal: `\x1b[31mabc\rX\nnext` paints BOTH lines red.