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/lib/i18n/messages/he/index.ts

@@ -0,0 +1,36 @@
+import { advancedSettingsMessages } from "./advancedSettings"
+import { appMessages } from "./app"
+import { commandMessages } from "./commands"
+import { dialogMessages } from "./dialogs"
+import { filesystemMessages } from "./filesystem"
+import { folderSelectionMessages } from "./folderSelection"
+import { instanceMessages } from "./instance"
+import { loadingScreenMessages } from "./loadingScreen"
+import { logMessages } from "./logs"
+import { markdownMessages } from "./markdown"
+import { messagingMessages } from "./messaging"
+import { remoteAccessMessages } from "./remoteAccess"
+import { sessionMessages } from "./session"
+import { settingsMessages } from "./settings"
+import { timeMessages } from "./time"
+import { toolCallMessages } from "./toolCall"
+import { mergeMessageParts } from "../merge"
+
+export const heMessages = mergeMessageParts(
+  folderSelectionMessages,
+  advancedSettingsMessages,
+  loadingScreenMessages,
+  timeMessages,
+  appMessages,
+  dialogMessages,
+  filesystemMessages,
+  instanceMessages,
+  logMessages,
+  sessionMessages,
+  messagingMessages,
+  toolCallMessages,
+  markdownMessages,
+  settingsMessages,
+  remoteAccessMessages,
+  commandMessages,
+)