feat: add user geolocation marker and auto-zoom to map based on search radius

docs/theme.md

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+# FuelAlert — Colour Palette
+
+## Primary — Burnt Sienna
+| Token        | Hex       | Usage                        |
+|--------------|-----------|------------------------------|
+| primary      | `#bb5b3e` | CTA buttons, focus rings, brand |
+| primary-dark | `#a34a31` | Hover / pressed state        |
+
+## Neutrals — Warm Brown
+| Token     | Hex       | Usage                        |
+|-----------|-----------|------------------------------|
+| text-base | `#4a3f3b` | Body text, headings          |
+| text-muted| `#89726c` | Secondary text, icons        |
+| text-dim  | `#6b5a55` | Tertiary / placeholder text  |
+
+## Surfaces — Cream / Linen
+| Token          | Hex       | Usage                        |
+|----------------|-----------|------------------------------|
+| surface        | `#faf6f3` | Input & card background      |
+| surface-page   | `#f5ede5` | Page / app background        |
+| surface-subtle | `#eeeae5` | Subtle surface / hover       |
+| border         | `#e5ded7` | Borders & dividers           |
+
+## Accents
+| Token  | Hex       | Usage                        |
+|--------|-----------|------------------------------|
+| teal   | `#4A7C7E` | Secondary accent (minor)     |
+| mauve  | `#8B4860` | Tertiary accent (minor)      |
+| tan    | `#9B8B6B` | Warm neutral accent          |
+
+## Status
+| Token   | Hex       | Usage                        |
+|---------|-----------|------------------------------|
+| success | `#22c55e` | Price current / good signal  |
+| warning | `#f59e0b` | Stale price / weak signal    |
+| error   | `#ef4444` | Outdated price / error state |
+
+## Notes
+- Core brand feel: warm terracotta on a cream/linen base.
+- Teal and mauve are currently used sparingly — confirm role in DaisyUI theme before promoting to named tokens.
+- Never use cold grays — all neutrals should lean warm.