fix: RTL text layout support in web UI (issue #16875)

[uriva]

Summary

• Converts hardcoded physical CSS properties to logical properties across 10 UI component files so that RTL layouts render correctly (padding-left → padding-inline-start, margin-left → margin-inline-start, text-align: left → text-align: start, border-left → border-inline-start, etc.)
• Expands RTL locale detection beyond Arabic to include Hebrew (he), Persian/Farsi (fa), and Urdu (ur) in the console dir() function
• Adds isRtl() export alongside dir() in the console language utility
• Adds shared @opencode-ai/util/rtl module with a comprehensive RTL language detection utility for use across packages
• Adds clarifying comments on direction: rtl CSS truncation-trick usages to distinguish them from actual RTL layout

Changes by file

File	Change
packages/console/app/src/lib/language.ts	Expand dir() to use RTL locale set; add isRtl() export
packages/util/src/rtl.ts	New — shared RTL direction detection with full ISO 639 language coverage
packages/ui/src/components/markdown.css	Lists, blockquotes, tables → logical properties
packages/ui/src/components/message-part.css	User message alignment, padding, text-align → logical properties
packages/ui/src/components/card.css	Card accent line and action padding → logical properties
packages/ui/src/components/message-nav.css	Nav padding and alignment → logical properties
packages/ui/src/components/tool-error-card.css	Content padding → logical properties
packages/ui/src/components/dialog.css	Dialog description padding → logical properties
packages/ui/src/components/file.css	Diff hunk padding/text-align → logical properties
packages/ui/src/components/session-turn.css	Truncation-trick comment
packages/ui/src/components/session-review.css	Truncation-trick comment

What this does NOT address

The TUI (terminal) layer uses OpenTUI which has zero RTL/Bidi support — all paddingLeft/paddingRight props, text alignment, and word-wrapping assume LTR. Proper TUI RTL support requires adding a Bidi algorithm to the OpenTUI Zig renderer, which is a separate effort.

Closes #16875
Related: #14257, #22076, #21676

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential duplicate found:

• feat: Add RTL (Right-to-Left) support for RTL languages in UI/Web/Desktop #14261 - "feat: Add RTL (Right-to-Left) support for RTL languages in UI/Web/Desktop"
  • This PR may be addressing similar RTL layout support goals for the UI. You should verify if it's still open and whether there's overlap in scope or if feat: Add RTL (Right-to-Left) support for RTL languages in UI/Web/Desktop #14261 has already been merged/closed.

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