v1.6.0 — Two-line grid layout

The status line now renders as two lines instead of one, making it readable on narrower
terminals. Colors are unchanged.

Changed

• Two-line grid layout: the segments are arranged in two rows of pipe-separated
  cells, and the pipes align vertically. Each column is as wide as the wider of its
  two cells (content-based; no terminal-width detection).

  Sonnet 5 ✦ high | 435k/1M 44%  | 5h  4%    @16:40 | +12 | ClaudeCodeStatusLine@main
  v2.1.198        | extra $0/$25 | 7d 12% Sun@19:00 | -3  | my-worktree
  

  Row 1: model with the ✦ thinking marker and effort level (one fused cell), tokens,
  5-hour usage, lines added, cwd@branch. Row 2: CLI version, extra usage, 7-day usage,
  lines removed, worktree. Cells with no data render a dim - so the grid stays
  aligned; the cwd cell is simply omitted when Claude Code supplies no working
  directory.

• Context percentage loses its parentheses: 435k/1M 44% instead of
  435k/1M (44%); the green percent is differentiation enough.

• Line changes get their own column: the unstaged (+N -M) suffix that rode inside
  the cwd cell is now a stacked column of its own (green +added over red -removed,
  no parentheses). As before, it appears only while the tree is dirty.

• Thinking marker position: the ✦ now sits between the model name and the effort
  word (Sonnet 5 ✦ high); previously it was appended after the effort word.

• 5h/7d internal alignment: the two usage cells right-align their percentages and
  stack their @ reset markers, so 4% sits under 12% and @16:40 under
  Sun@19:00.

• Extra usage is always visible when enabled: the cell shows dollar figures
  whenever the account has extra usage enabled, including a $0 month (previously the
  segment was hidden until something was spent). It shows a dim - when extra usage
  is disabled or no API data is available.

• Whole-dollar amounts drop the cents: $0/$25 instead of $0.00/$25.00;
  fractional amounts keep two decimals ($3.50).

• Version cell placeholder: when the CLI version cannot be determined, the cell
  renders a dim - instead of disappearing.

Added

• Worktree segment: row 2 ends with the worktree name when the session runs in a
  Claude Code --worktree isolation session (stdin worktree.name), and a dim -
  otherwise.

Fixed

• Locale-independent ✦ width (Bash): under a C/POSIX locale the ✦ thinking marker
  was measured as 3 bytes instead of 1 display column, over-padding the first column
  and misaligning the pipes below it. Column widths now count it as a single column
  in any locale. Verified against bash 3.2.57, the version macOS ships.