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/styles/components/settings-screen.css

@@ -43,7 +43,7 @@
   padding: 1.25rem;
   background:
     linear-gradient(180deg, color-mix(in oklab, var(--surface-secondary) 92%, var(--accent-primary) 8%), var(--surface-secondary));
-  border-right: 1px solid var(--border-base);
+  border-inline-end: 1px solid var(--border-base);
 }
 
 .settings-screen-nav-header {
@@ -121,6 +121,9 @@
   color: var(--text-primary);
   transform: translateX(2px);
 }
+[dir="rtl"] .settings-nav-button[data-selected="true"] {
+  transform: translateX(-2px);
+}
 
 .settings-nav-button-icon {
   width: 1rem;
@@ -360,7 +363,7 @@
   border: 1px solid var(--border-base);
   background: var(--surface-base);
   color: var(--text-primary);
-  text-align: left;
+  text-align: start;
   transition: border-color 140ms ease, background-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
   outline: none;
   cursor: pointer;
@@ -418,7 +421,7 @@
 }
 
 .settings-choice-check {
-  margin-left: auto;
+  margin-inline-start: auto;
   color: var(--accent-primary);
   opacity: 0;
 }
@@ -488,7 +491,7 @@
   .settings-screen-nav {
     gap: 0.75rem;
     padding: 1rem;
-    border-right: none;
+    border-inline-end: none;
     border-bottom: 1px solid var(--border-base);
   }