feat(electrobun): fixes + 7 new features (terminal input, file browser, memory, toasts)

Fixes:
- Terminal accepts keyboard input (echo mode with prompt)
- Terminal drawer collapses properly (display:none preserves xterm state)

Features:
- 6 project tabs: Model | Docs | Context | Files | SSH | Memory
- FileBrowser.svelte: recursive tree with expand/collapse + file preview
- MemoryTab.svelte: memory cards with trust badges (human/agent/auto)
- Subagent tree in AgentPane (demo: search-agent, test-runner)
- Drag resize handle between agent pane and terminal
- Theme dropdown in Settings (4 Catppuccin flavors)
- ToastContainer.svelte: auto-dismiss notifications

ui-electrobun/src/mainview/Terminal.svelte

@@ -34,6 +34,13 @@
   let term: Terminal;
   let fitAddon: FitAddon;
 
+  // Current line buffer for demo shell simulation
+  let lineBuffer = '';
+
+  function writePrompt() {
+    term.write('\r\n\x1b[1;34m~/code/ai/agent-orchestrator\x1b[0m \x1b[32m$\x1b[0m ');
+  }
+
   onMount(() => {
     term = new Terminal({
       theme: THEME,
@@ -67,9 +74,43 @@
     term.writeln('     \x1b[1;32mRunning\x1b[0m tests/unit.rs');
     term.writeln('test result: ok. \x1b[32m47 passed\x1b[0m; 0 failed');
     term.writeln('');
-    term.writeln('\x1b[1;34m~/code/ai/agent-orchestrator\x1b[0m \x1b[32m$\x1b[0m \x1b[5m▊\x1b[0m');
+    term.write('\x1b[1;34m~/code/ai/agent-orchestrator\x1b[0m \x1b[32m$\x1b[0m ');
 
-    // Resize on window resize
+    // Input handler — simulate local shell until real PTY is connected
+    term.onData((data: string) => {
+      for (const ch of data) {
+        const code = ch.charCodeAt(0);
+
+        if (ch === '\r') {
+          // Enter key — echo newline, execute (demo), write new prompt
+          const cmd = lineBuffer.trim();
+          lineBuffer = '';
+          if (cmd === '') {
+            writePrompt();
+          } else if (cmd === 'clear') {
+            term.clear();
+            term.write('\x1b[1;34m~/code/ai/agent-orchestrator\x1b[0m \x1b[32m$\x1b[0m ');
+          } else {
+            term.write('\r\n');
+            term.writeln(`\x1b[31mbash: ${cmd}: command not found\x1b[0m`);
+            writePrompt();
+          }
+        } else if (code === 127 || ch === '\x08') {
+          // Backspace
+          if (lineBuffer.length > 0) {
+            lineBuffer = lineBuffer.slice(0, -1);
+            term.write('\b \b');
+          }
+        } else if (code >= 32 && code !== 127) {
+          // Printable character — echo and buffer
+          lineBuffer += ch;
+          term.write(ch);
+        }
+        // Ignore control characters (Ctrl+C etc. — no real PTY)
+      }
+    });
+
+    // Resize on container resize
     const ro = new ResizeObserver(() => fitAddon.fit());
     ro.observe(termEl);