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).

src/settings-tab.ts

@@ -0,0 +1,95 @@
+import { App, PluginSettingTab, Setting } from "obsidian";
+import type DateCalcPlugin from "../main";
+
+export class DateCalcSettingTab extends PluginSettingTab {
+  constructor(app: App, private plugin: DateCalcPlugin) {
+    super(app, plugin);
+  }
+
+  display(): void {
+    const { containerEl } = this;
+    containerEl.empty();
+
+    containerEl.createEl("h2", { text: "Date Calc" });
+
+    // Documentation link
+    const docsDiv = containerEl.createDiv({
+      cls: "setting-item-description date-calc-settings-docs",
+    });
+    docsDiv.createEl("a", {
+      text: "📖 View Full Documentation",
+      href: "https://github.com/thelegend09/date-calculator",
+    });
+
+    new Setting(containerEl)
+      .setName("Debug logging")
+      .setDesc("Logs decoration activity to the console.")
+      .addToggle((t) =>
+        t.setValue(this.plugin.settings.debug).onChange(async (v) => {
+          this.plugin.settings.debug = v;
+          await this.plugin.saveData(this.plugin.settings);
+        })
+      );
+
+    new Setting(containerEl)
+      .setName("Hide result while cursor inside")
+      .setDesc("Prevents the widget from showing while you edit inline/fenced code.")
+      .addToggle((t) =>
+        t.setValue(this.plugin.settings.hideResultWhileCursorInside).onChange(async (v) => {
+          this.plugin.settings.hideResultWhileCursorInside = v;
+          await this.plugin.saveData(this.plugin.settings);
+        })
+      );
+
+    new Setting(containerEl)
+      .setName("Verbose output")
+      .setDesc(
+        "When enabled, show longer/wordier messages. Can be overridden per-calculation with verbose=true/false."
+      )
+      .addToggle((t) =>
+        t.setValue(this.plugin.settings.verbose).onChange(async (v) => {
+          this.plugin.settings.verbose = v;
+          await this.plugin.saveData(this.plugin.settings);
+        })
+      );
+
+    // Usage examples section
+    containerEl.createEl("h3", { text: "Usage Examples" });
+
+    const examplesDiv = containerEl.createDiv({ cls: "date-calc-examples" });
+
+    // Inline examples
+    examplesDiv.createEl("h4", { text: "Inline Code (single backticks)" });
+    const inlineList = examplesDiv.createEl("ul");
+    inlineList.createEl("li").setText("`date-calc: birthday=2003-02-15`");
+    inlineList.createEl("li").setText("`date-calc: countdown to=2026-12-31 label=\"New Year\"`");
+    inlineList.createEl("li").setText("`date-calc: since=2024-01-01`");
+    inlineList.createEl("li").setText("`date-calc: diff from=2024-01-01 to=2024-12-31`");
+    inlineList.createEl("li").setText("`date-calc: birthday=1992-08-16 verbose=true`");
+
+    // Block examples
+    examplesDiv.createEl("h4", { text: "Fenced Blocks (triple backticks)" });
+
+    examplesDiv
+      .createEl("pre", { cls: "date-calc-example-block" })
+      .setText("```date-calc\ntype: birthday\nbirthday: 1992-08-16\n```");
+
+    examplesDiv
+      .createEl("pre", { cls: "date-calc-example-block" })
+      .setText(
+        "```date-calc\ntype: countdown\nto: 2026-12-31 23:59\nlabel: New Year\nverbose: true\n```"
+      );
+
+    examplesDiv
+      .createEl("pre", { cls: "date-calc-example-block" })
+      .setText("```date-calc\ntype: diff\nfrom: 2024-01-01\nto: 2024-12-31\n```");
+
+    // Tips section
+    examplesDiv.createEl("h4", { text: "Tips" });
+    const tipsList = examplesDiv.createEl("ul");
+    tipsList.createEl("li").setText("Use YYYY-MM-DD format for dates");
+    tipsList.createEl("li").setText("Add time with YYYY-MM-DD HH:mm for precise countdowns");
+    tipsList.createEl("li").setText("Supported types: birthday, countdown, since, diff");
+    tipsList.createEl("li").setText("Add verbose=true/false to override global setting");
+  }
+}