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/folder-selection-view.tsx

@@ -45,6 +45,7 @@ const FolderSelectionView: Component<FolderSelectionViewProps> = (props) => {
     { value: "ru", label: "Русский" },
     { value: "ja", label: "日本語" },
     { value: "zh-Hans", label: "简体中文" },
+    { value: "he", label: "עברית" },
   ]
 
   const selectedLanguageOption = () => languageOptions.find((opt) => opt.value === locale()) ?? languageOptions[0]
@@ -341,7 +342,7 @@ const FolderSelectionView: Component<FolderSelectionViewProps> = (props) => {
           class="w-full max-w-5xl h-full px-4 sm:px-8 pb-2 flex flex-col overflow-hidden"
           aria-busy={isLoading() ? "true" : "false"}
         >
-          <div class="absolute top-4 left-6">
+          <div class="absolute top-4" style="inset-inline-start: 1.5rem;">
             <Select<LanguageOption>
               value={selectedLanguageOption()}
               onChange={(value) => {
@@ -385,7 +386,7 @@ const FolderSelectionView: Component<FolderSelectionViewProps> = (props) => {
               </Select.Portal>
             </Select>
           </div>
-          <div class="absolute top-4 right-6 flex items-center gap-2">
+          <div class="absolute top-4 flex items-center gap-2" style="inset-inline-end: 1.5rem;">
             <button
               type="button"
               class="selector-button selector-button-secondary w-auto p-2 inline-flex items-center justify-center"