Add new page feature

[Kirit0-00]

I have added a '+' option to add new page to existing hand-written notes pdf.

Summary by CodeRabbit

• New Features

  • Added ability to append pages to existing PDFs using templates.
  • New UI modals and toolbar buttons for selecting PDFs and choosing templates.
  • Template-based page selection with support for prefilled favorites.

• Chores

  • Added PDF library dependency for page manipulation.
  • Updated build configuration with JSON plugin support.

[coderabbitai]

Caution

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📝 Walkthrough

Walkthrough

This PR adds the ability to append pages from template PDFs to existing PDF documents in an Obsidian plugin. It introduces the pdf-lib dependency, configures Rollup to handle JSON, creates two UI modals for user interaction (template and PDF selection), implements PDF manipulation utilities, and integrates the new feature into the plugin's toolbar and commands.

Changes

PDF Page Append Feature

Layer / File(s)	Summary
Dependencies & Build Config package.json, rollup.config.js	Add pdf-lib (production) and @rollup/plugin-json (dev) dependencies; configure Rollup to process JSON via the imported json() plugin in the build pipeline.
UI Modals src/dialogs/AppendPageModal.ts, src/dialogs/TemplateSelectModal.ts	AppendPageModal provides PDF file selection via PdfFileSuggest helper and template dropdown, returning an AppendPageResult. TemplateSelectModal loads templates from a folder, populates a dropdown with preselection logic, and submits the chosen template.
Core Utilities src/utils/utils.ts	appendPageToPdf reads existing and template PDFs from vault, loads them with pdf-lib, copies the template's first page, appends it to the existing PDF, and writes the result back. appendAddPageButton appends a styled "Add page" button to toolbars with async click handling.
Plugin Integration src/main.ts	Register new append-page-to-pdf command and add "Add Page" buttons to PDF toolbars and Markdown embeds; buttons trigger TemplateSelectModal, validate template and PDF existence, then invoke appendPageToPdf with error handling via notices.

Sequence Diagram

sequenceDiagram
    participant User
    participant AddPageButton as "Add Page Button"
    participant TemplateModal as "TemplateSelectModal"
    participant AppendLogic as "appendPageToPdf<br/>(pdf-lib)"
    participant Vault as "Vault Storage"

    User->>AddPageButton: Click "Add Page"
    AddPageButton->>TemplateModal: Open modal
    User->>TemplateModal: Select template
    TemplateModal-->>AddPageButton: Return template path
    AddPageButton->>AppendLogic: Validate & call appendPageToPdf
    AppendLogic->>Vault: Read template PDF
    AppendLogic->>Vault: Read existing PDF
    AppendLogic->>AppendLogic: Load PDFs with pdf-lib
    AppendLogic->>AppendLogic: Copy template's first page
    AppendLogic->>AppendLogic: Append to existing PDF
    AppendLogic->>Vault: Write modified PDF back
    AppendLogic-->>AddPageButton: Complete / Error

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 A rabbit hops through PDFs with glee,
Appending new pages for all to see!
With modals and magic from pdf-lib's might,
Templates blend seamlessly, oh what a sight!
Pages now multiply—hop, skip, and bound! 📄✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Add new page feature' accurately reflects the main objective described in the PR - adding the ability to append pages to existing PDFs. It directly aligns with both the PR description and the substantial changes across multiple files.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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