docs(03-01): complete inline edit affordance and form spinners plan

- SUMMARY.md created with TDD execution record
- STATE.md: progress 75%, decisions added, session updated
- ROADMAP.md: phase 03 progress updated (3/4 plans complete)
- REQUIREMENTS.md: IXTN-01, IXTN-02, IXTN-03 marked complete

.planning/phases/03-interaction-quality-and-completeness/03-01-SUMMARY.md

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+---
+phase: 03-interaction-quality-and-completeness
+plan: 01
+subsystem: frontend-interaction
+tags: [inline-edit, spinner, ux, tdd, callbacks]
+dependency_graph:
+  requires: ["03-00"]
+  provides: ["pencil-icon-affordance", "save-callbacks", "form-spinners"]
+  affects: ["BillsTracker", "future-row-flash-feedback"]
+tech_stack:
+  added: []
+  patterns: ["TDD red-green", "try/catch in async handler", "optional callback props"]
+key_files:
+  created: []
+  modified:
+    - frontend/src/components/InlineEditCell.tsx
+    - frontend/src/components/InlineEditCell.test.tsx
+    - frontend/src/pages/LoginPage.tsx
+    - frontend/src/pages/RegisterPage.tsx
+    - frontend/src/components/BudgetSetup.tsx
+decisions:
+  - "onSaveSuccess/onSaveError are optional callbacks — callers opt in to row-flash behavior in downstream plans"
+  - "Pencil icon uses data-testid='pencil-icon' for reliable test targeting in jsdom"
+  - "Budget Edit spinner deferred — no BudgetEdit form component exists in codebase yet"
+metrics:
+  duration: "2 minutes"
+  completed: "2026-03-11T21:32:34Z"
+  tasks_completed: 2
+  files_modified: 5
+---
+
+# Phase 3 Plan 1: Inline Edit Affordance and Form Spinners Summary
+
+**One-liner:** Pencil-icon hover affordance + onSaveSuccess/onSaveError callbacks in InlineEditCell, and Spinner in Login/Register/BudgetSetup submit buttons for loading feedback.
+
+## What Was Built
+
+### Task 1: Enhanced InlineEditCell (TDD)
+- Added `Pencil` icon from `lucide-react` in display mode (opacity-0, group-hover:opacity-100 via CSS)
+- Added `onSaveSuccess?: () => void` callback — fires after successful `onSave`
+- Added `onSaveError?: () => void` callback — fires on `onSave` rejection; input value reverts to original
+- Wrapped `onSave` call in try/catch inside `handleBlur`
+- 4 new tests: pencil icon DOM presence, success callback, error callback + value revert, no-callback-when-value-unchanged
+
+### Task 2: Form Spinners
+- `LoginPage.tsx`: Button shows `<Spinner />` when `loading=true`, disabled, `min-w-[120px]`
+- `RegisterPage.tsx`: Button shows `<Spinner />` when `loading=true`, disabled, `min-w-[120px]`
+- `BudgetSetup.tsx`: Button shows `<Spinner />` when `saving=true`, disabled, `min-w-[120px]`
+- Budget Edit spinner explicitly deferred — no BudgetEdit component exists yet
+
+## Commits
+
+| Task | Commit | Description |
+|------|--------|-------------|
+| Test RED | 58bb57b | test(03-01): add failing tests for pencil icon, onSaveSuccess, and onSaveError callbacks |
+| Task 1 GREEN | d9e60fa | feat(03-01): enhance InlineEditCell with pencil icon hover affordance and save/error callbacks |
+| Task 2 | 30ec2d5 | feat(03-01): add loading spinners to Login, Register, and BudgetSetup submit buttons |
+
+## Verification
+
+- All 9 InlineEditCell tests pass (including 4 new)
+- All 43 tests pass across full suite (11 pre-existing skips)
+- Production build: zero TypeScript errors
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Self-Check: PASSED
+
+All files found. All commits verified (58bb57b, d9e60fa, 30ec2d5). Build passes. 43 tests pass.