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/instance/instance-shell2.tsx

@@ -81,7 +81,8 @@ interface InstanceShellProps {
 }
 
 const InstanceShell2: Component<InstanceShellProps> = (props) => {
-  const { t } = useI18n()
+  const { t, locale } = useI18n()
+  const isRTL = () => locale() === "he"
 
   const [sessionSidebarWidth, setSessionSidebarWidth] = createSignal(DEFAULT_SESSION_SIDEBAR_WIDTH)
   const [rightDrawerWidth, setRightDrawerWidth] = createSignal(
@@ -371,7 +372,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
           sx={{
             width: `${sessionSidebarWidth()}px`,
             flexShrink: 0,
-            borderRight: "1px solid var(--border-base)",
+            borderInlineEnd: "1px solid var(--border-base)",
             backgroundColor: "var(--surface-secondary)",
             height: "100%",
             minHeight: 0,
@@ -413,7 +414,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
     const modalProps = container ? { container: container as Element } : undefined
     return (
       <Drawer
-        anchor="left"
+        anchor={isRTL() ? "right" : "left"}
         variant="temporary"
         open={leftOpen()}
         onClose={closeLeftDrawer}
@@ -422,7 +423,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
           "& .MuiDrawer-paper": {
             width: isPhoneLayout() ? "100vw" : `${sessionSidebarWidth()}px`,
             boxSizing: "border-box",
-            borderRight: isPhoneLayout() ? "none" : "1px solid var(--border-base)",
+            borderInlineEnd: isPhoneLayout() ? "none" : "1px solid var(--border-base)",
             backgroundColor: "var(--surface-secondary)",
             backgroundImage: "none",
             color: "var(--text-primary)",
@@ -480,7 +481,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
           sx={{
             width: `${rightDrawerWidth()}px`,
             flexShrink: 0,
-            borderLeft: "1px solid var(--border-base)",
+            borderInlineStart: "1px solid var(--border-base)",
             backgroundColor: "var(--surface-secondary)",
             height: "100%",
             minHeight: 0,
@@ -523,7 +524,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
     const modalProps = container ? { container: container as Element } : undefined
     return (
       <Drawer
-        anchor="right"
+        anchor={isRTL() ? "left" : "right"}
         variant="temporary"
         open={rightOpen()}
         onClose={closeRightDrawer}
@@ -532,7 +533,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
           "& .MuiDrawer-paper": {
             width: isPhoneLayout() ? "100vw" : `${rightDrawerWidth()}px`,
             boxSizing: "border-box",
-            borderLeft: isPhoneLayout() ? "none" : "1px solid var(--border-base)",
+            borderInlineStart: isPhoneLayout() ? "none" : "1px solid var(--border-base)",
             backgroundColor: "var(--surface-secondary)",
             backgroundImage: "none",
             color: "var(--text-primary)",
@@ -742,7 +743,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
                   <Kbd shortcut="cmd+shift+p" />
                 </span>
 
-                <div class="ml-auto flex items-center gap-3">
+                <div class="ms-auto flex items-center gap-3">
                   <div class="connection-status-meta flex items-center gap-3">
                     <Show when={connectionStatus() === "connected"}>
                       <span class="status-indicator connected">