[UX] British spelling: rename optimization → optimisation throughout code (conflict resolve)

[FEAT] Add OR-substitutable resource family pools and rename inputs.csv

[UX] app.py: British spelling (Optimizer -> Optimiser, Optimization -> Optimisation)

[UX] address user feedback: per-year template text and column header, more visible "Add resource" button, fixed next-tab navigation on all pages, updated method constraints intro text

[FIX] welcome: update intro text for target audience, style 'Let's get started...' with gradient, add page bottom padding globally

[FIX] app: initialize session state at app level to prevent crashes on direct tab navigation

Update app.py

Update app.py

[FIX] app.py: initialize all methods as disabled, let tab2 sync re-activate them

[FIX] Auto-disable methods with only hidden resources and force tab2 widget sync on navigation

[FIX] Force module reload and cache clear after CSV auto-update to avoid double restart

[DOC] Readme updated with instructions on adding data and updating libraries

[FIX] Try fixing the position of the sidebar

[DOCS/FIX] First draft of Objective No. 5: TO FACILITATE MAINTENANCE AND UPDATES FOR CG STAFF. (No more hard-coded settings, libraries updated, instructions added to the README)

[FEAT] objective 2: More flexible resources input

[FEAT] Objective 2: Modifying the graphical user interface to add custom resources + Test CSS

[FEAT] Goal 1 almost achieved: two types of limits possible(percentage / absolute value), start of unit conversion, adapted export templates and a bug fix in the ‘Coefficients’ tab (some resources not displayed)

[FEAT] scenario & input management: Excel/JSON/ZIP(csv) import, save/export, multi-scenario comparison, clear all data

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