feat: better dev diagnostics and error messaging.

[knightedcodemonkey]

• fixes Improve Error Messages and Source Context for Template Literal JSX #33

[codecov]

Codecov Report

❌ Patch coverage is 86.69065% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.17%. Comparing base (dbe0fb9) to head (d3a2756).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/internal/template-diagnostics.ts	82.53%	8 Missing and 14 partials ⚠️
src/debug/diagnostics.ts	72.72%	3 Missing and 6 partials ⚠️
src/internal/dev-environment.ts	92.00%	0 Missing and 2 partials ⚠️
src/loader/jsx.ts	95.23%	0 Missing and 2 partials ⚠️
src/runtime/shared.ts	91.30%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   90.08%   89.17%   -0.92%     
==========================================
  Files          10       15       +5     
  Lines        1220     1459     +239     
  Branches      341      392      +51     
==========================================
+ Hits         1099     1301     +202     
- Misses         32       44      +12     
- Partials       89      114      +25     

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