1.1.0: fix Live Preview crash, add Reading View inline support, birthday labels

- Fix RangeSetBuilder ordering crash: inline and fenced-block decorations
  are now merged and sorted before being added, instead of two unsorted
  passes (crashed whenever a fenced block preceded inline code in a note).
- Add explicit @codemirror/state and @codemirror/view devDependencies
  (previously only transitive via @codemirror/language).
- Add Reading View support for inline `date-calc:` spans via
  registerMarkdownPostProcessor (previously Live Preview only), mirroring
  the approach used by Dataview's inline queries.
- Fix verbose=false being silently truthy (non-empty string) in inline
  key=value config, which meant it never actually disabled verbose output.
- Fix diff type auto-inference: from/to was dead code (countdown's check
  always matched first); reordered so from+to or start+end infer diff.
- Implement documented but missing birthday label support: cfg.label,
  falling back to frontmatter name ("Jane's age:"), then "Age:".
- Split main.ts (777 lines) into src/ modules per AGENTS.md conventions.
- Fix duplicated command-palette prefixes, move inline JS styles to
  styles.css, fix package.json author, drop orphaned showArrow setting.

Verified: unit tests against the real bundled logic (mocked obsidian
module), a reproduction of the RangeSetBuilder crash against the real
@codemirror/state package, and live end-to-end testing in Obsidian via
CDP/Playwright (Tchernobyl vault).

package-lock.json

@@ -1,15 +1,17 @@
 {
-	"name": "obsidian-sample-plugin",
-	"version": "1.0.0",
+	"name": "date-calculator",
+	"version": "1.1.0",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
-			"name": "obsidian-sample-plugin",
-			"version": "1.0.0",
+			"name": "date-calculator",
+			"version": "1.1.0",
 			"license": "MIT",
 			"devDependencies": {
 				"@codemirror/language": "^6.12.1",
+				"@codemirror/state": "^6.5.2",
+				"@codemirror/view": "^6.38.2",
 				"@lezer/common": "^1.5.0",
 				"@types/node": "^16.11.6",
 				"@typescript-eslint/eslint-plugin": "5.29.0",