Add Web Push, guided start screen, SVG icons, chunked uploads, rename

- Web Push (VAPID + RFC 8291, pure Rust): permission/question/finished
  notifications while no app window is visible; settings with test button
- Guided new-session flow: task, craft target (website/app/game/old
  software/fresh), clean room or deep, description, model, folder
  (new, existing or cloned git repository); originals upload to original/
- Craft phase bar (craft_phase tool) for study/specify/build/check/ready
- Chunked uploads (8 MB) up to server.max_upload_mb (default 500 MB)
- All UI glyphs and emojis replaced by themeable SVG icons
- Rename dialog with manual name or model-generated suggestion

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/src/tools/agent.rs

@@ -55,6 +55,48 @@ impl Tool for TodoWrite {
 
 // ---------------------------------------------------------------------------
 
+pub const CRAFT_PHASES: &[&str] = &["study", "specify", "build", "check", "ready"];
+
+/// Craft workflow: report the current phase (shown as a progress bar).
+pub struct CraftPhase;
+
+#[async_trait]
+impl Tool for CraftPhase {
+    fn name(&self) -> &str {
+        "craft_phase"
+    }
+    fn description(&self) -> String {
+        "Report the craft phase you are entering (study, specify, build, check, ready). The user sees it \
+         as a progress bar. Call it at the start of every phase, also when you go back to an earlier one."
+            .into()
+    }
+    fn schema(&self) -> Value {
+        json!({"type": "object", "properties": {
+            "phase": {"type": "string", "enum": CRAFT_PHASES},
+            "note": {"type": "string", "description": "One short sentence: what happens in this phase"}
+        }, "required": ["phase"]})
+    }
+    fn read_only(&self) -> bool {
+        true
+    }
+    fn title(&self, input: &Value) -> String {
+        format!("Phase: {}", input["phase"].as_str().unwrap_or("?"))
+    }
+    async fn run(&self, input: Value, ctx: &ToolCtx) -> Result<ToolOutput> {
+        let phase = arg_str(&input, "phase")?;
+        if !CRAFT_PHASES.contains(&phase) {
+            bail!("unknown phase '{phase}' – use one of {}", CRAFT_PHASES.join(", "));
+        }
+        let root = ctx.app.root_session_id(&ctx.session_id);
+        let mut s = ctx.app.session(&root)?;
+        s.phase = Some(phase.to_string());
+        ctx.app.save_session(s)?;
+        Ok(ToolOutput::text(format!("Phase: {phase}")).with_meta(json!({"phase": phase, "note": input["note"]})))
+    }
+}
+
+// ---------------------------------------------------------------------------
+
 pub struct AskUser;
 
 #[async_trait]

server/src/tools/mod.rs

@@ -159,6 +159,7 @@ pub fn builtin_tools() -> Vec<Arc<dyn Tool>> {
         Arc::new(crate::shells::KillShell),
         Arc::new(web::WebFetch),
         Arc::new(web::WebSearch),
+        Arc::new(agent::CraftPhase),
         Arc::new(crate::lsp::Diagnostics),
         Arc::new(agent::TodoWrite),
         Arc::new(agent::AskUser),