feat(i18n): Hebrew locale + full RTL support (#243)

# feat(i18n): Hebrew locale + full RTL support

## Summary

This PR adds full Hebrew (he) locale support to the UI, including a
complete translation of all user-facing strings and comprehensive RTL
layout support across all components.

## What was done

### Hebrew translation
- Full translation of all i18n message files for the `he` locale (17
translation files)
- Registered the language in the i18n system and the language picker

### RTL support
- Automatic direction detection (`dir="rtl"`) when Hebrew is selected
- Replaced physical CSS properties (`left`/`right`) with logical
equivalents (`inline-start`/`inline-end`) across the project
- Fixed resize direction, file path alignment, and textarea padding
- Fixed navigation button positioning in textarea for RTL
- Fixed scrollbar direction in RTL
- Fixed code block direction and selector alignment
- Fixed Monaco editor direction in the file viewer
- Auto-detect text direction in reasoning block (`dir="auto"` +
`unicode-bidi: plaintext`)

### Adapted components
- `session-layout` — sidebar and resize handle
- `prompt-input` — text direction and buttons
- `message-base` — message blocks and reasoning
- `message-timeline` — timeline bar
- `right-panel` — right side panel
- `tool-call` — tool call display
- `settings-screen` — settings page
- `selector` — selection component
- `instance-shell` — main shell

## New files

```
packages/ui/src/lib/i18n/messages/he/
  advancedSettings.ts
  app.ts
  commands.ts
  dialogs.ts
  filesystem.ts
  folderSelection.ts
  index.ts
  instance.ts
  loadingScreen.ts
  logs.ts
  markdown.ts
  messaging.ts
  remoteAccess.ts
  session.ts
  settings.ts
  time.ts
  toolCall.ts
```

## Suggested testing
- Switch language to Hebrew and verify all strings are translated
- Verify RTL layout is correct across all screens (session, settings,
file viewer)
- Verify that English text inside a reasoning block is displayed LTR
- Switch back to English and verify everything returns to LTR

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Shantur Rathore <i@shantur.com>

packages/ui/src/components/worktree-selector.tsx

@@ -18,6 +18,7 @@ import {
   setWorktreeSlugForParentSession,
 } from "../stores/worktrees"
 import { sessions } from "../stores/sessions"
+import { useI18n } from "../lib/i18n"
 
 const log = getLogger("session")
 
@@ -25,8 +26,6 @@ type WorktreeOption =
   | { kind: "action"; key: "__create__"; label: string }
   | { kind: "worktree"; key: string; slug: string; directory: string; raw: WorktreeDescriptor }
 
-const CREATE_OPTION: WorktreeOption = { kind: "action", key: "__create__", label: "+ Create worktree" }
-
 function preventSelectPress(event: PointerEvent | MouseEvent) {
   // Prevent Select.Item from treating this as a selection.
   // We intentionally prevent default to stop Kobalte's internal press handling.
@@ -71,6 +70,7 @@ interface WorktreeSelectorProps {
 }
 
 export default function WorktreeSelector(props: WorktreeSelectorProps) {
+  const { t } = useI18n()
   const [isOpen, setIsOpen] = createSignal(false)
   const [createOpen, setCreateOpen] = createSignal(false)
   const [createSlug, setCreateSlug] = createSignal("")
@@ -99,7 +99,8 @@ export default function WorktreeSelector(props: WorktreeSelectorProps) {
       directory: wt.directory,
       raw: wt,
     }))
-    return [CREATE_OPTION, ...mapped]
+    const createOption: WorktreeOption = { kind: "action", key: "__create__", label: t("instanceShell.worktree.create") }
+    return [createOption, ...mapped]
   })
 
   const selectedOption = createMemo<WorktreeOption | undefined>(() => {