feat: phase 10 — reconnection, encoding 10, disconnect button

Frontend reconnection:
- WebSocket auto-reconnects with exponential backoff (1s → 30s)
- Re-authenticates with OmniView to get fresh APPLET_ID on reconnect
- Credentials stored in sessionStorage for automatic re-login
- Status bar shows connection state and reconnect countdown
- Disconnect button returns to login screen

Encoding 10 (Raw with tile interleave):
- codec/raw_tile.rs: decodes encoding 10 per ByteColorRFBRenderer.for()
- Flag byte bit 0 selects plain raw vs 16x16 tile-interleaved data
- Deinterleave handles edge tiles smaller than 16x16
- Wired into session dispatch
- 2 unit tests

39 tests passing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/ericrfb/src/session.rs

@@ -1,7 +1,7 @@
 use std::io::{BufReader, BufWriter};
 use std::net::TcpStream;
 
-use crate::codec::{hextile, tight};
+use crate::codec::{hextile, raw_tile, tight};
 use crate::framebuffer::Framebuffer;
 use crate::handshake::{self, Config, ServerInit};
 use crate::msg::{self, ServerMsg};
@@ -200,7 +200,6 @@ impl ActiveSession {
                         .copy_rect(src_x, src_y, hdr.x, hdr.y, hdr.w, hdr.h);
                 }
                 5 => {
-                    // Hextile
                     hextile::decode_hextile(
                         &mut self.reader,
                         &mut self.framebuffer,
@@ -222,6 +221,16 @@ impl ActiveSession {
                         hdr.h,
                     )?;
                 }
+                10 => {
+                    raw_tile::decode_raw_tile(
+                        &mut self.reader,
+                        &mut self.framebuffer,
+                        hdr.x,
+                        hdr.y,
+                        hdr.w,
+                        hdr.h,
+                    )?;
+                }
                 other => {
                     return Err(SessionError::UnsupportedEncoding(other));
                 }