Add comprehensive test suite for progress tracking system

Test fixture updates:
- Add toolUseId fields (toolu_read1, toolu_edit1) to tool_use blocks
- Add parentToolUseID-linked progress events for read and edit tools
- Add orphaned SessionStart progress event (no parent)
- Update tool_result references to match new toolUseId values
- Add bash_progress and mcp_progress subtypes for subtype derivation

session-parser tests (7 new):
- toolUseId extraction from tool_use blocks with and without id field
- parentToolUseId and progressSubtype extraction from hook_progress
- Subtype derivation for bash_progress, mcp_progress, agent_progress
- Fallback to "hook" for unknown data types
- Undefined parentToolUseId when field is absent

progress-grouper tests (7 new):
- Partition parented progress into toolProgress map
- Remove parented progress from filtered messages array
- Keep orphaned progress (no parentToolUseId) in main stream
- Keep progress with invalid parentToolUseId (no matching tool_call)
- Empty input handling
- Sort each group by rawIndex
- Multiple tool_call parents tracked independently

agent-progress-parser tests (full suite):
- Parse user text events with prompt/agentId metadata extraction
- Parse tool_use blocks into AgentToolCall events
- Parse tool_result blocks with content extraction
- Parse text content as text_response with line counting
- Handle multiple content blocks in single turn
- Post-pass tool_result→tool_call linking (sourceTool, language)
- Empty input and malformed JSON → raw_content fallback
- stripLineNumbers for cat-n prefixed output
- summarizeToolCall for Read, Grep, Glob, Bash, Task, WarpGrep, etc.

ProgressBadge component tests:
- Collapsed state shows pill counts, hides content
- Expanded state shows all event content via markdown
- Subtype counting accuracy
- Agent-only events route to AgentProgressView

AgentProgressView component tests:
- Prompt banner rendering with truncation
- Agent ID and turn count display
- Summary rows with timestamps and tool names
- Click-to-expand drill-down content

html-exporter tests (8 new):
- Collapsible rendering for thinking, tool_call, tool_result
- Toggle button and JavaScript inclusion
- Non-collapsible messages lack collapse attributes
- Diff content detection and highlighting
- Progress badge rendering with toolProgress data

filters tests (2 new):
- hook_progress included/excluded by category toggle

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/unit/filters.test.ts

@@ -112,6 +112,19 @@ describe("filters", () => {
     expect(filtered.every((m) => m.category === "tool_call" || m.category === "tool_result")).toBe(true);
   });
 
+  it("hook_progress included when category is enabled", () => {
+    const enabled = new Set<MessageCategory>(ALL_CATEGORIES);
+    const filtered = filterMessages(messages, enabled);
+    expect(filtered.find((m) => m.category === "hook_progress")).toBeDefined();
+  });
+
+  it("hook_progress excluded when category is disabled", () => {
+    const enabled = new Set<MessageCategory>(ALL_CATEGORIES);
+    enabled.delete("hook_progress");
+    const filtered = filterMessages(messages, enabled);
+    expect(filtered.find((m) => m.category === "hook_progress")).toBeUndefined();
+  });
+
   it("category counts are computed correctly", () => {
     const counts: Record<string, number> = {};
     for (const cat of ALL_CATEGORIES) {