docs: add app icon design/implementation chat summary

Co-authored-by: Cursor <cursoragent@cursor.com>

chat-summaries/2026-09-22_12-10-app-icon-design-implementation-summary.md

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+# App Icon Design & Implementation Summary
+
+**Date:** 2026-09-22 12:10
+**Task:** Design and implement an SVG app icon following Android adaptive icon guidelines
+
+## Task Description
+
+Designed and implemented a custom app icon for Video Clipper, replacing the default Tauri branding. The icon depicts scissors cutting diagonally across a film strip, rendered in a Material Design + gradient hybrid style with a shadcn-inspired dark palette.
+
+## Process
+
+1. **Brainstorming** — Explored project context, asked clarifying questions (style, subject, color palette, background), proposed 3 approaches (diagonal scissors over film strip, scissors silhouette with notch, scissors framing play triangle), user selected Approach A
+2. **Design spec** — Wrote detailed spec covering canvas/adaptive icon structure, foreground artwork composition, five color palette variants, SVG structure, and output files → `docs/superpowers/specs/2026-09-22-app-icon-design.md`
+3. **Implementation plan** — 4-task plan covering SVG creation, variant generation, rasterization pipeline, and project reference updates → `docs/superpowers/plans/2026-09-22-app-icon.md`
+4. **Subagent-driven execution** — All 4 tasks implemented and reviewed via subagent-driven development
+
+## Design Decisions
+
+- **Style:** Material Design geometry + modern gradients, shadcn-inspired dark palette
+- **Subject:** Open scissors cutting a film strip diagonally
+- **Background:** Solid zinc-900 (`#18181b`)
+- **Chosen variant:** Orange (`#fb923c` → `#ea580c` blade gradient, `#f97316` cut accent)
+- **Safe zone:** Inner 66% (338×338px) for adaptive icon compatibility
+
+## Changes Made
+
+### Commits (4)
+1. `cc34a05` — feat: add base SVG app icon (blue variant)
+2. `b32d5cb` — feat: add icon color variant generation script and 5 variants
+3. `3aa8fb2` — feat: generate platform icons from chosen variant
+4. `7786bca` — chore: replace default Tauri branding with app icon
+
+### Files Created
+- `src-tauri/icons/icon.svg` — Source SVG (orange variant)
+- `src-tauri/icons/variants/icon-{blue,purple,green,orange,mono}.svg` — All 5 color variants
+- `src-tauri/icons/32x32.png`, `128x128.png`, `128x128@2x.png` — Tauri bundle PNGs
+- `src-tauri/icons/icon.icns` — macOS app icon
+- `src-tauri/icons/icon.ico` — Windows app icon
+- `src-tauri/icons/` — Additional iOS/Android/Appx icons (generated by `tauri icon`)
+- `static/favicon.svg` — Web favicon (SVG)
+- `static/favicon-32.png` — Web favicon fallback (PNG)
+- `scripts/generate-icon-variants.sh` — Color variant generation script
+- `docs/superpowers/specs/2026-09-22-app-icon-design.md` — Design spec
+- `docs/superpowers/plans/2026-09-22-app-icon.md` — Implementation plan
+
+### Files Modified
+- `index.html` — Added favicon `<link>` elements
+
+### Files Deleted
+- `static/tauri.svg` — Default Tauri branding removed
+
+## Tools Used
+- `rsvg-convert` — SVG → PNG rasterization
+- `npx tauri icon` — Multi-platform icon generation from source PNG
+- `xmllint` — SVG validation
+
+## Follow-up Items
+- Visual tuning of SVG coordinates may be needed after seeing the icon at various sizes in production
+- The icon geometry is approximate (hand-authored coordinates); if proportions look off at small sizes (16px favicon), a simplified variant could be created
+- Android XML files generated by `tauri icon` have missing trailing newlines (cosmetic)
+
+## Lessons Learned
+- `npx tauri icon` accepts a source PNG and generates all platform icon files automatically (PNGs, ICNS, ICO, iOS, Android) — much simpler than manual rasterization
+- `rsvg-convert` (from librsvg, installed via brew) is available on macOS for high-quality SVG → PNG conversion
+- Android adaptive icons require a 66% safe zone — critical artwork must fit within the inner 338×338px of a 512×512 canvas
+- Hand-authoring SVG path coordinates without visual feedback is inherently approximate; the plan correctly identified visual iteration as an expected part of the process