feat(ui): add support line number in "Open file in editor" for zed

[seiichi1101]

Summary

When $EDITOR is Zed, pressing e opens the correct file but does not jump to the selected line.
Zed accepts path:line (its CLI help documents path:line:column), so this passes the line number the same way #496 did for Helix.

Changes

• buildEditorCommand(): handle zed and zeditor (Linux distro package CLI name) with ${filePath}:${line}
• One test covering zed --wait (path:line plus preserved flags) and zeditor; the existing "unknown editor" test example moves from zed --new-window to a neutral placeholder since Zed is no longer unknown
• Changeset entry (patch)

Verification

• bun test packages/hunk/src/ui/lib/openInEditor.test.ts (19 pass), bun run typecheck, bun run lint, bun run format:check, bun run deps:check all pass
• bun run test: 4 failures remain in test/cli (HUNK_NODE_ADAPTER_BUNDLE not built, --watch from local user config, local git log date format). They reproduce identically on main with bun test test/cli test/session and are unrelated to this change.
• zed --help (Linux, Zed CLI) confirms [PATHS_WITH_POSITION]... with path:line:column syntax. Not manually exercised in the TUI.

Related: #310 (original e shortcut), #496 (Helix line support)

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