Feat/add sol

[0xfaan]

Summary

 2   
 3   <!-- One or two sentences explaining what this PR does and why. -->
 4   
 5   Closes #<!-- issue number -->
 6   
 7   ---
 8   
 9   ## Type of Change
10   
11   <!-- Check all that apply -->
12   
13   - [ ] 🐛 Bug fix (non-breaking change that fixes an issue)
14   - [ ] 🚀 New feature (non-breaking change that adds functionality)
15   - [ ] 💥 Breaking change (fix or feature that would cause existing behaviour to change)
16   - [ ] ♻️ Refactor (no functional change, code quality improvement)
17   - [ ] 🎨 UI / design update
18   - [ ] 📦 Dependency update
19   - [ ] 🔧 Configuration / tooling change
20   - [ ] 📝 Documentation update
21   - [ ] 🔒 Security fix
22   
23   ---
24   
25   ## Changes Made
26   
27   <!-- Bullet-point list of concrete changes in this PR. -->
28   
29   - 
30   - 
31   - 
32   
33   ---
34   
35   ## Testing
36   
37   <!-- Describe what you tested and how. -->
38   
39   - [ ] Manual testing in local development (`npm run dev`)
40   - [ ] Unit tests added or updated (`npm test`)
41   - [ ] Existing tests still pass (`npm test`)
42   - [ ] Tested on Stellar **Testnet** (if blockchain changes are included)
43   - [ ] Tested with demo mode OFF (`NEXT_PUBLIC_DEMO_MODE=false`)
44   - [ ] Verified on mobile viewport (if UI changes are included)
45   
46   **Test steps for reviewers:**
47   
48   1. 
49   2. 
50   3. 
51   
52   ---
53   
54   ## Screenshots / Screen Recording
55   
56   <!-- For UI changes, paste before/after screenshots or a short recording.
57        Drag and drop images directly into this text box. -->
58   
59   | Before | After |
60   |--------|-------|
61   |        |       |
62   
63   ---
64   
65   ## Checklist
66   
67   <!-- All boxes must be checked before requesting review. -->
68   
69   ### Code Quality
70   - [ ] Code follows the project's style and conventions (ESLint passes: `npm run lint`)
71   - [ ] TypeScript types are correct (no new `any` without justification): `npm run type-check`
72   - [ ] No secrets, wallet keys, or PII committed to the repository
73   - [ ] New `NEXT_PUBLIC_*` variables added to `.env.example` (if applicable)
74   
75   ### Observability
76   - [ ] New API routes use `captureError` / `log` from `lib/observability`
77   - [ ] New Stellar SDK calls are wrapped in try/catch forwarding to `captureError`
78   - [ ] No sensitive data (private keys, mnemonics, tokens) passed to `log.*` or `captureError`
79   
80   ### Security
81   - [ ] User inputs are validated with Zod (or equivalent) before processing
82   - [ ] No new server-side secrets are exposed via `NEXT_PUBLIC_*` variables
83   - [ ] Webhook signatures are verified where applicable
84   - [ ] Rate limiting applied to new public API endpoints (Upstash)
85   
86   ### Accessibility (UI changes only)
87   - [ ] Interactive elements have accessible labels (`aria-label`, `aria-describedby`)
88   - [ ] Colour contrast meets WCAG AA (4.5:1 for normal text)
89   - [ ] Keyboard navigation works for new interactive components
90   
91   ### Documentation
92   - [ ] Inline code comments added for non-obvious logic
93   - [ ] README or docs updated if the change affects setup or configuration
94   - [ ] `SECURITY.md` updated if the change affects the security surface (rare)
95   
96   ---
97   
98   ## Deployment Notes
99   

100
102
103 -
104
105 ---
106
107 ## Related Issues / PRs
108
109
110
111 -

Closes #280

Closes #282

Closes #281

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